Update supporters.json

Author: danibentrup

data/supporters.json

@@ -1017,6 +1017,16 @@
           "twitter": "WebConsultsEu"
         }
       ]
-    }
-  ]
-}
+    },
+    {
+      "name": "Apache Flink Meetup Berlin",
+      "city": "Berlin",
+      "country": "Germany",
+      "link": "http://www.meetup.com/de-DE/Apache-Flink-Meetup/",
+      "contacts": [
+        {
+          "name": "Daniela Bentrup",
+          "twitter": "danibentrup",
+          "email": "[email protected]"
+        }
+      ]