[Git] Fix `deleted` and `inserted` regexp. 

The `deleted` and `inserted` regexp were missing some usecase (when lines contain `-` or `+` char).

See #227.
You should use the negative lookahead `(?!...)` for that - this is the exact use case of it.
Also you can just use `.+` instead of `[^\n]` if you're using the `m` modifier. 

So everything will be even simpler:


```js
'deleted': /^-(?!-).+$/m,
'inserted': /^\+(?!\+).+$/m,
```