docs: update .all-contributorsrc [skip ci]

.all-contributorsrc

@@ -234,6 +234,15 @@
       "contributions": [
         "bug"
       ]
+    },
+    {
+      "login": "jlec",
+      "name": "Justin Lecher",
+      "avatar_url": "https://avatars.githubusercontent.com/u/79732?v=4",
+      "profile": "https://jlec.de",
+      "contributions": [
+        "ideas"
+      ]
     }
   ],
   "contributorsPerLine": 7,