Update readme (add node version requirements) and update .editorconfig

.editorconfig

@@ -9,9 +9,12 @@ indent_style = space
 insert_final_newline = true
 trim_trailing_whitespace = true
 
-[*.md]
+[*.{md,markdown}]
 trim_trailing_whitespace = false
 
 [{*.yml,*.json}]
 indent_size = 4
 indent_style = space
+
+[*.{ms,mustache}]
+insert_final_newline = false