Replace codecov with orbs

We can reduce npm dependencies by using orbs provided by CircleCI.

.circleci/config.yml

@@ -1,4 +1,6 @@
 version: 2.1
+orbs:
+  codecov: codecov/[email protected]
 jobs:
   build:
     docker:
@@ -12,4 +14,5 @@ jobs:
       - run: npm run lint
       - run: npm run build
       - run: npm test
-      - run: npm run codecov
+      - codecov/upload:
+          file: coverage/lcov.info

package.json

@@ -10,8 +10,7 @@
     "test": "karma start karma.conf.js --single-run",
     "test:local": "karma start karma.conf.js --single-run --testRPCAddr=http://localhost:8080",
     "test:watch": "karma start karma.conf.js",
-    "lint": "eslint . --fix --ext .ts",
-    "codecov": "cat coverage/lcov.info | codecov"
+    "lint": "eslint . --fix --ext .ts"
   },
   "repository": {
     "type": "git",
@@ -34,7 +33,6 @@
     "@typescript-eslint/eslint-plugin": "^3.9.1",
     "@typescript-eslint/parser": "^3.9.1",
     "chai": "^4.2.0",
-    "codecov": "^3.7.2",
     "eslint": "^7.7.0",
     "eslint-plugin-prettier": "^3.1.4",
     "husky": "^4.2.5",