Improved editorconfig

Author: Jaid

.editorconfig

@@ -6,4 +6,7 @@ end_of_line = lf
 indent_size = 2
 indent_style = space
 insert_final_newline = false
-trim_trailing_whitespace = true
+trim_trailing_whitespace = true
+
+[/package.json]
+insert_final_newline = false # npm install rewrites the JSON file with a final newline, so we manually keep them to prevent unneeded stashes