docs: add Arkenan as a contributor for code (#118)

Author: allcontributors[bot]

.all-contributorsrc

@@ -38,6 +38,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "Arkenan",
+      "name": "Tomás Arjovsky",
+      "avatar_url": "https://avatars.githubusercontent.com/u/6244161?v=4",
+      "profile": "https://github.com/Arkenan",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "commitType": "docs",

README.md

@@ -227,6 +227,7 @@ This Code of Conduct is adapted from the [Contributor Covenant](https://www.cont
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/MegaRedHand"><img src="https://avatars.githubusercontent.com/u/47506558?v=4?s=100" width="100px;" alt="Tomás"/><br /><sub><b>Tomás</b></sub></a><br /><a href="https://github.com/lambdaclass/lambda_ethereum_consensus/commits?author=MegaRedHand" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/mpaulucci"><img src="https://avatars.githubusercontent.com/u/1040971?v=4?s=100" width="100px;" alt="Martin Paulucci"/><br /><sub><b>Martin Paulucci</b></sub></a><br /><a href="https://github.com/lambdaclass/lambda_ethereum_consensus/commits?author=mpaulucci" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/Arkenan"><img src="https://avatars.githubusercontent.com/u/6244161?v=4?s=100" width="100px;" alt="Tomás Arjovsky"/><br /><sub><b>Tomás Arjovsky</b></sub></a><br /><a href="https://github.com/lambdaclass/lambda_ethereum_consensus/commits?author=Arkenan" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://www.linkedin.com/in/paul-henrykajfasz/"><img src="https://avatars.githubusercontent.com/u/42912740?v=4?s=100" width="100px;" alt="Paul-Henry Kajfasz"/><br /><sub><b>Paul-Henry Kajfasz</b></sub></a><br /><a href="https://github.com/lambdaclass/lambda_ethereum_consensus/commits?author=phklive" title="Code">💻</a></td>
     </tr>
   </tbody>