Add \*.md to list of files indented by spaces instead of tabs, in .editorconfig

Author: jacobcassidy

.editorconfig

@@ -10,6 +10,6 @@ trim_trailing_whitespace = true
 
 # The indent size used in the `package.json` file cannot be changed
 # https://github.com/npm/npm/pull/3180#issuecomment-16336516
-[{*.yml,*.yaml,*.cson,package.json}]
+[{*.md,*.yml,*.yaml,*.cson,package.json}]
 indent_style = space
 indent_size = 2