fix(config): pass options to cosmiconfig according to 5.x.x API (#100)

**What**:
I've updated babel-plugin-macros' usage of cosmiconfig to use the 5.x.x API.

**Why**:
This project's dependency on cosmiconfig was updated from 4.x.x to 5.x.x, but without changing the calls to cosmiconfig.

Thus, the configuration override was no longer being read (packageProp was not overridden, thus using `babelMacros` in package.json no longer worked).

The tests still passed as they only checked `babel-plugin-macros.config.js`, which was read by default by cosmiconfig: https://github.com/davidtheclark/cosmiconfig#searchplaces

.all-contributorsrc

@@ -150,6 +150,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "lPadier",
+      "name": "Loïc Padier",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/4009640?v=4",
+      "profile": "http://loicpadier.com",
+      "contributions": [
+        "code"
+      ]
     }
   ]
 }

README.md

@@ -13,7 +13,7 @@ Enables zero-config, importable babel plugins
 [![downloads][downloads-badge]][npmchart]
 [![MIT License][license-badge]][license]
 
-[![All Contributors](https://img.shields.io/badge/all_contributors-15-orange.svg?style=flat-square)](#contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-16-orange.svg?style=flat-square)](#contributors)
 [![PRs Welcome][prs-badge]][prs]
 [![Donate][donate-badge]][donate]
 [![Code of Conduct][coc-badge]][coc]
@@ -347,7 +347,7 @@ Thanks goes to these people ([emoji key][emojis]):
 | [<img src="https://avatars.githubusercontent.com/u/1500684?v=3" width="100px;"/><br /><sub><b>Kent C. Dodds</b></sub>](https://kentcdodds.com)<br />[💻](https://github.com/kentcdodds/babel-plugin-macros/commits?author=kentcdodds "Code") [📖](https://github.com/kentcdodds/babel-plugin-macros/commits?author=kentcdodds "Documentation") [🚇](#infra-kentcdodds "Infrastructure (Hosting, Build-Tools, etc)") [⚠️](https://github.com/kentcdodds/babel-plugin-macros/commits?author=kentcdodds "Tests") | [<img src="https://avatars1.githubusercontent.com/u/18808?v=3" width="100px;"/><br /><sub><b>Sunil Pai</b></sub>](https://github.com/threepointone)<br />[🤔](#ideas-threepointone "Ideas, Planning, & Feedback") | [<img src="https://avatars3.githubusercontent.com/u/1341513?v=3" width="100px;"/><br /><sub><b>Stephen Scott</b></sub>](http://suchipi.com/)<br />[💬](#question-suchipi "Answering Questions") [📖](https://github.com/kentcdodds/babel-plugin-macros/commits?author=suchipi "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/767261?v=4" width="100px;"/><br /><sub><b>Michiel Dral</b></sub>](http://twitter.com/dralletje)<br />[🤔](#ideas-dralletje "Ideas, Planning, & Feedback") | [<img src="https://avatars2.githubusercontent.com/u/662750?v=4" width="100px;"/><br /><sub><b>Kye Hohenberger</b></sub>](https://github.com/tkh44)<br />[🤔](#ideas-tkh44 "Ideas, Planning, & Feedback") | [<img src="https://avatars1.githubusercontent.com/u/11481355?v=4" width="100px;"/><br /><sub><b>Mitchell Hamilton</b></sub>](https://hamil.town)<br />[💻](https://github.com/kentcdodds/babel-plugin-macros/commits?author=mitchellhamilton "Code") [⚠️](https://github.com/kentcdodds/babel-plugin-macros/commits?author=mitchellhamilton "Tests") | [<img src="https://avatars1.githubusercontent.com/u/1288694?v=4" width="100px;"/><br /><sub><b>Justin Hall</b></sub>](https://github.com/wKovacs64)<br />[📖](https://github.com/kentcdodds/babel-plugin-macros/commits?author=wKovacs64 "Documentation") |
 | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
 | [<img src="https://avatars3.githubusercontent.com/u/1903016?v=4" width="100px;"/><br /><sub><b>Brian Pedersen</b></sub>](https://github.com/PiereDome)<br />[💻](https://github.com/kentcdodds/babel-plugin-macros/commits?author=PiereDome "Code") [📖](https://github.com/kentcdodds/babel-plugin-macros/commits?author=PiereDome "Documentation") | [<img src="https://avatars3.githubusercontent.com/u/4495237?v=4" width="100px;"/><br /><sub><b>Andrew Palm</b></sub>](https://github.com/apalm)<br />[💻](https://github.com/kentcdodds/babel-plugin-macros/commits?author=apalm "Code") | [<img src="https://avatars1.githubusercontent.com/u/1527371?v=4" width="100px;"/><br /><sub><b>Michael Hsu</b></sub>](https://michaelhsu.tw/)<br />[📖](https://github.com/kentcdodds/babel-plugin-macros/commits?author=evenchange4 "Documentation") [🔌](#plugin-evenchange4 "Plugin/utility libraries") | [<img src="https://avatars2.githubusercontent.com/u/16605186?v=4" width="100px;"/><br /><sub><b>Bo Lingen</b></sub>](https://github.com/citycide)<br />[💻](https://github.com/kentcdodds/babel-plugin-macros/commits?author=citycide "Code") | [<img src="https://avatars1.githubusercontent.com/u/11150235?v=4" width="100px;"/><br /><sub><b>Tyler Haas</b></sub>](https://github.com/tylerthehaas)<br />[📖](https://github.com/kentcdodds/babel-plugin-macros/commits?author=tylerthehaas "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/1250430?v=4" width="100px;"/><br /><sub><b>FWeinb</b></sub>](https://github.com/FWeinb)<br />[💻](https://github.com/kentcdodds/babel-plugin-macros/commits?author=FWeinb "Code") | [<img src="https://avatars2.githubusercontent.com/u/827862?v=4" width="100px;"/><br /><sub><b>Tomáš Ehrlich</b></sub>](http://www.tomasehrlich.cz)<br />[🐛](https://github.com/kentcdodds/babel-plugin-macros/issues?q=author%3Atricoder42 "Bug reports") [💻](https://github.com/kentcdodds/babel-plugin-macros/commits?author=tricoder42 "Code") |
-| [<img src="https://avatars0.githubusercontent.com/u/4331946?v=4" width="100px;"/><br /><sub><b>Jonas Gierer</b></sub>](https://github.com/jgierer12)<br />[📖](https://github.com/kentcdodds/babel-plugin-macros/commits?author=jgierer12 "Documentation") |
+| [<img src="https://avatars0.githubusercontent.com/u/4331946?v=4" width="100px;"/><br /><sub><b>Jonas Gierer</b></sub>](https://github.com/jgierer12)<br />[📖](https://github.com/kentcdodds/babel-plugin-macros/commits?author=jgierer12 "Documentation") | [<img src="https://avatars2.githubusercontent.com/u/4009640?v=4" width="100px;"/><br /><sub><b>Loïc Padier</b></sub>](http://loicpadier.com)<br />[💻](https://github.com/kentcdodds/babel-plugin-macros/commits?author=lPadier "Code") |
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors][all-contributors] specification.

src/index.js

@@ -223,14 +223,20 @@ function getConfig(macro, filename, source) {
       // FWIW, this thing told me that cosmiconfig is 227.1 kb of minified JS
       // so that's probably significant... https://bundlephobia.com/[email protected]
       // Note that cosmiconfig will cache the babel-plugin-macros config 👍
-      const explorer = require('cosmiconfig')('babel-plugin-macros')
-      const loaded = explorer.searchSync(filename, {
+      const explorer = require('cosmiconfig')('babel-plugin-macros', {
+        searchPlaces: [
+          'package.json',
+          `.babel-plugin-macrosrc`,
+          `.babel-plugin-macrosrc.json`,
+          `.babel-plugin-macrosrc.yaml`,
+          `.babel-plugin-macrosrc.yml`,
+          `.babel-plugin-macrosrc.js`,
+          `babel-plugin-macros.config.js`,
+        ],
         packageProp: 'babelMacros',
-        rc: '.babel-plugin-macrosrc',
-        js: 'babel-plugin-macros.config.js',
-        rcExtensions: true,
         sync: true,
       })
+      const loaded = explorer.searchSync(filename)
       if (loaded) {
         return loaded.config[macro.options.configName]
       }