[#3112] .gitattributes fix.

.gitattributes

@@ -1,9 +1,10 @@
 *.ex diff=elixir
 *.exs diff=elixir
 
-# Most os js/css files included in the repo are minified bundles,
-#   and we don't want to search/diff those as text files. Exceptions are listed below.
+priv/static/instance/static.css diff=css
+
+# Most of js/css files included in the repo are minified bundles,
+#   and we don't want to search/diff those as text files.
 *.js binary
 *.js.map binary
 *.css binary
-priv/static/instance/static.css diff=css