docs: add robertvolkmann as a contributor for review (iluwatar#2295)

* docs: update README.md [skip ci]

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

* docs: update README.md [skip ci]

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

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -2086,7 +2086,8 @@
       "avatar_url": "https://avatars.githubusercontent.com/u/20912167?v=4",
       "profile": "https://github.com/robertvolkmann",
       "contributions": [
-        "code"
+        "code",
+        "review"
       ]
     },
     {

README.md

@@ -368,7 +368,7 @@ This project is licensed under the terms of the MIT license.
       <td align="center"><a href="https://github.com/steph88ss"><img src="https://avatars.githubusercontent.com/u/111041594?v=4?s=100" width="100px;" alt="steph88ss"/><br /><sub><b>steph88ss</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=steph88ss" title="Documentation">📖</a></td>
       <td align="center"><a href="http://yujanranjitkar.com.np"><img src="https://avatars.githubusercontent.com/u/63731234?v=4?s=100" width="100px;" alt="Yujan Ranjitkar"/><br /><sub><b>Yujan Ranjitkar</b></sub></a><br /><a href="#translation-0xYujan" title="Translation">🌍</a></td>
       <td align="center"><a href="https://github.com/yusha-g"><img src="https://avatars.githubusercontent.com/u/110189579?v=4?s=100" width="100px;" alt="yusha-g"/><br /><sub><b>yusha-g</b></sub></a><br /><a href="#translation-yusha-g" title="Translation">🌍</a></td>
-      <td align="center"><a href="https://github.com/robertvolkmann"><img src="https://avatars.githubusercontent.com/u/20912167?v=4?s=100" width="100px;" alt="Robert Volkmann"/><br /><sub><b>Robert Volkmann</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=robertvolkmann" title="Code">💻</a></td>
+      <td align="center"><a href="https://github.com/robertvolkmann"><img src="https://avatars.githubusercontent.com/u/20912167?v=4?s=100" width="100px;" alt="Robert Volkmann"/><br /><sub><b>Robert Volkmann</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=robertvolkmann" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Arobertvolkmann" title="Reviewed Pull Requests">👀</a></td>
       <td align="center"><a href="https://github.com/bipin-k"><img src="https://avatars.githubusercontent.com/u/21119358?v=4?s=100" width="100px;" alt="Bipin Kumar Chaurasia"/><br /><sub><b>Bipin Kumar Chaurasia</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=bipin-k" title="Documentation">📖</a></td>
       <td align="center"><a href="https://github.com/KyleSong30"><img src="https://avatars.githubusercontent.com/u/100892032?v=4?s=100" width="100px;" alt="KyleSong30"/><br /><sub><b>KyleSong30</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=KyleSong30" title="Documentation">📖</a></td>
     </tr>