add Ionic Berlin to supporters (#133)

* add Ionic Berlin to supporters

* fix invalid json

* fix invalid json 2

Author: zwacky

data/supporters.json

@@ -1369,6 +1369,18 @@
           "twitter": "operatino"
         }
       ]
+    },
+    {
+      "name": "Ionic Berlin",
+      "city": "Berlin",
+      "country": "Germany",
+      "link": "https://www.meetup.com/Ionic-Berlin/",
+      "contacts": [
+        {
+          "name": "IonicBerlin",
+          "twitter": "IonicBerlin"
+        }
+      ]
     }
   ]
 }