docs: add @miyajan as a contributor (#935)

Author: miyajan

.all-contributorsrc

@@ -106,6 +106,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "miyajan",
+      "name": "Miyata Jumpei",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/945853?v=4",
+      "profile": "https://github.com/miyajan",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7

README.md

@@ -139,6 +139,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://haroen.me"><img src="https://avatars3.githubusercontent.com/u/6270048?v=4" width="100px;" alt=""/><br /><sub><b>Haroen Viaene</b></sub></a><br /><a href="https://github.com/algolia/shipjs/commits?author=Haroenv" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/heavenshell"><img src="https://avatars1.githubusercontent.com/u/56591?v=4" width="100px;" alt=""/><br /><sub><b>Shinya Ohyanagi</b></sub></a><br /><a href="https://github.com/algolia/shipjs/commits?author=heavenshell" title="Code">💻</a></td>
     <td align="center"><a href="https://donghoon-song.github.io"><img src="https://avatars0.githubusercontent.com/u/32301380?v=4" width="100px;" alt=""/><br /><sub><b>Donghoon Song</b></sub></a><br /><a href="https://github.com/algolia/shipjs/commits?author=donghoon-song" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/miyajan"><img src="https://avatars1.githubusercontent.com/u/945853?v=4" width="100px;" alt=""/><br /><sub><b>Miyata Jumpei</b></sub></a><br /><a href="https://github.com/algolia/shipjs/commits?author=miyajan" title="Code">💻</a></td>
   </tr>
 </table>