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

Author: rikutons

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

@@ -37,7 +37,7 @@ class RubyToBlocksConverter {
             VariablesConverter,
             MyBlocksConverter,
             MicroBitConverter,
-			MusicConverter,
+            MusicConverter,
             EV3Converter
         ];
         this.reset();