Add fedora support (#105)

Author: bastelfreak

metadata.json

@@ -70,6 +70,14 @@
         "2016.03"
       ]
     },
+    {
+      "operatingsystem": "Fedora",
+      "operatingsystemrelease": [
+        "25",
+        "26",
+        "27"
+      ]
+    },
     {
       "operatingsystem": "Archlinux"
     }