[CHANGE] index.js's unnatural tab to space

Author: rikutons

src/lib/ruby-to-blocks-converter/index.js

@@ -38,7 +38,7 @@ class RubyToBlocksConverter {
             VariablesConverter,
             MyBlocksConverter,
             MicroBitConverter,
-			MusicConverter,
+            MusicConverter,
             EV3Converter,
             Wedo2Converter
         ];