Make sure the editorconfig indent size applies to all file formats

I was glancing at the Vue PR, and was tired of scrolling horizontally on files with a lot of levels. I first discovered the `?ts=2` query string for GitHub, but then [read here](https://stackoverflow.com/a/33831598/1935861) that it will respect the `indent_size` for tabs, which is rather nifty.

.editorconfig

@@ -6,6 +6,7 @@ root = true
 
 [*]
 indent_style = tab
+indent_size = 2
 
 end_of_line = lf
 charset = utf-8
@@ -17,4 +18,3 @@ trim_trailing_whitespace = false
 
 [*.{json,yml}]
 indent_style = space
-indent_size = 2