Merge pull request #111 from doppem15/master

Added my name to Catrobat credits

Author: reichli

_data/contributors.json

@@ -3232,6 +3232,11 @@
       "firstname": "Muhamed",
       "lastname": "Murica",
       "github": "moe-threeface"
+    },
+    {
+      "firstname": "Markus",
+      "lastname": "Doppelreiter",
+      "github": "doppem15"
     }
   ]
 }