docs: update .all-contributorsrc [skip ci]

Author: allcontributors[bot]

.all-contributorsrc

@@ -336,6 +336,17 @@
         "doc",
         "bug"
       ]
+    },
+    {
+      "login": "gparlakov",
+      "name": "Georgi Parlakov",
+      "avatar_url": "https://avatars.githubusercontent.com/u/3482199?v=4",
+      "profile": "https://github.com/gparlakov",
+      "contributions": [
+        "code",
+        "bug",
+        "maintenance"
+      ]
     }
   ],
   "contributorsPerLine": 7,