docs: add choldgraf as a contributor for code, and review (#315)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

---------

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -660,6 +660,16 @@
       "contributions": [
         "review"
       ]
+    },
+    {
+      "login": "choldgraf",
+      "name": "Chris Holdgraf",
+      "avatar_url": "https://avatars.githubusercontent.com/u/1839645?v=4",
+      "profile": "http://chrisholdgraf.com",
+      "contributions": [
+        "code",
+        "review"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -1,6 +1,6 @@
 # <img src="https://www.pyopensci.org/images/logo.png" width=100 /> pyOpenSci scientific Python Packaging Guide
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-64-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-65-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 ![GitHub release (latest by date)](https://img.shields.io/github/v/release/pyopensci/python-package-guide?color=purple&display_name=tag&style=plastic)
@@ -157,6 +157,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     </tr>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/WeepingClown13"><img src="https://avatars.githubusercontent.com/u/95921427?v=4?s=100" width="100px;" alt="Ananthu C V"/><br /><sub><b>Ananthu C V</b></sub></a><br /><a href="https://github.com/pyOpenSci/python-package-guide/pulls?q=is%3Apr+reviewed-by%3AWeepingClown13" title="Reviewed Pull Requests">👀</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="http://chrisholdgraf.com"><img src="https://avatars.githubusercontent.com/u/1839645?v=4?s=100" width="100px;" alt="Chris Holdgraf"/><br /><sub><b>Chris Holdgraf</b></sub></a><br /><a href="https://github.com/pyOpenSci/python-package-guide/commits?author=choldgraf" title="Code">💻</a> <a href="https://github.com/pyOpenSci/python-package-guide/pulls?q=is%3Apr+reviewed-by%3Acholdgraf" title="Reviewed Pull Requests">👀</a></td>
     </tr>
   </tbody>
 </table>