(GH-289) Fix block comment declaration

This commit fixes the declaration for block comments by setting it to an
array.

Author: jpogran

languages/puppet-language-configuration.json

@@ -3,7 +3,7 @@
     // symbol used for single line comment. Remove this entry if your language does not support line comments
     "lineComment": "#",
     // symbols used for start and end a block comment. Remove this entry if your language does not support block comments
-    "blockComment": "#"
+    "blockComment": ["#"]
   },
   // symbols used as brackets
   "brackets": [