docs: add psteinb as a contributor for ideas (#113)

* docs: update README.md

* docs: update .all-contributorsrc

---------

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

.all-contributorsrc

@@ -171,6 +171,15 @@
       "contributions": [
         "ideas"
       ]
+    },
+    {
+      "login": "psteinb",
+      "name": "Peter Steinbach",
+      "avatar_url": "https://avatars.githubusercontent.com/u/1465603?v=4",
+      "profile": "https://twitter.com/psteinb_",
+      "contributions": [
+        "ideas"
+      ]
     }
   ]
 }

README.md

@@ -73,12 +73,13 @@ Current maintainers of this lesson are
       <td align="center" valign="top" width="14.28%"><a href="http://michaelc-m.com"><img src="https://avatars.githubusercontent.com/u/15881370?v=4?s=100" width="100px;" alt="Michael Culshaw-Maurer"/><br /><sub><b>Michael Culshaw-Maurer</b></sub></a><br /><a href="#content-MCMaurer" title="Content">🖋</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://giordano.github.io"><img src="https://avatars.githubusercontent.com/u/765740?v=4?s=100" width="100px;" alt="Mosè Giordano"/><br /><sub><b>Mosè Giordano</b></sub></a><br /><a href="#userTesting-giordano" title="User Testing">📓</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/Myrkwid"><img src="https://avatars.githubusercontent.com/u/102226458?v=4?s=100" width="100px;" alt="Myrkwid"/><br /><sub><b>Myrkwid</b></sub></a><br /><a href="#code-Myrkwid" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://twitter.com/psteinb_"><img src="https://avatars.githubusercontent.com/u/1465603?v=4?s=100" width="100px;" alt="Peter Steinbach"/><br /><sub><b>Peter Steinbach</b></sub></a><br /><a href="#ideas-psteinb" title="Ideas, Planning, & Feedback">🤔</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://gitlab.com/fiveop"><img src="https://avatars.githubusercontent.com/u/65829?v=4?s=100" width="100px;" alt="Philipp Matthias Schäfer"/><br /><sub><b>Philipp Matthias Schäfer</b></sub></a><br /><a href="#content-fiveop" title="Content">🖋</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://sarahlrstevens.info"><img src="https://avatars.githubusercontent.com/u/5558419?v=4?s=100" width="100px;" alt="Sarah Stevens"/><br /><sub><b>Sarah Stevens</b></sub></a><br /><a href="#design-sstevens2" title="Design">🎨</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/BeastyBlacksmith"><img src="https://avatars.githubusercontent.com/u/18145188?v=4?s=100" width="100px;" alt="Simon Christ"/><br /><sub><b>Simon Christ</b></sub></a><br /><a href="#content-BeastyBlacksmith" title="Content">🖋</a> <a href="#code-BeastyBlacksmith" title="Code">💻</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="https://tbyhdgs.info"><img src="https://avatars.githubusercontent.com/u/9694524?v=4?s=100" width="100px;" alt="Toby Hodges"/><br /><sub><b>Toby Hodges</b></sub></a><br /><a href="#infra-tobyhodges" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
     </tr>
     <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://tbyhdgs.info"><img src="https://avatars.githubusercontent.com/u/9694524?v=4?s=100" width="100px;" alt="Toby Hodges"/><br /><sub><b>Toby Hodges</b></sub></a><br /><a href="#infra-tobyhodges" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
       <td align="center" valign="top" width="14.28%"><a href="http://www.trevorkeller.com"><img src="https://avatars.githubusercontent.com/u/2179347?v=4?s=100" width="100px;" alt="Trevor Keller"/><br /><sub><b>Trevor Keller</b></sub></a><br /><a href="#content-tkphd" title="Content">🖋</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/lokamani"><img src="https://avatars.githubusercontent.com/u/64150921?v=4?s=100" width="100px;" alt="lokamani"/><br /><sub><b>lokamani</b></sub></a><br /><a href="#content-lokamani" title="Content">🖋</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ocaisa"><img src="https://avatars.githubusercontent.com/u/3840437?v=4?s=100" width="100px;" alt="ocaisa"/><br /><sub><b>ocaisa</b></sub></a><br /><a href="#infra-ocaisa" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>