add gab

sherlock/resources/data.json

@@ -695,6 +695,14 @@
     "username_claimed": "adam",
     "username_unclaimed": "noonewouldeverusethis7"
   },
+  "Gab": {
+    "errorMsg": "The page you are looking for isn't here.",
+    "errorType": "message",
+    "url": "https://gab.com/{}",
+    "urlMain": "https://gab.com",
+    "username_claimed": "a",
+    "username_unclaimed": "noonewouldeverusethis"
+  }
   "GaiaOnline": {
     "errorMsg": "No user ID specified or user does not exist",
     "errorType": "message",