fix(languages): update GitHub languages JSON file

jaebradley · jaebradley · commit 835ce13b84be · 2018-05-22T14:51:33.000Z
diff --git a/src/languages.json b/src/languages.json
@@ -4616,7 +4616,7 @@
       ".mkd",
       ".mkdn",
       ".mkdown",
-      ".ron",
+      ".ronn",
       ".workbook"
     ],
     "tmScope": "source.gfm",
