Change `self.get_view_settings()` to `self.settings`
Change `self.get_view_settings()` to `self.settings`

It appears that [`SublimeLinter#get_view_settings`](http://www.sublimelinter.com/en/v3.10.10/linter_methods.html#get-view-settings)
has been deprecatedand replaced by a simple call to `self.settings`.

This commit makes the appropriate change and returns
`SublimeLinter-flow` to a working state with no warnings.

SublimeLinter/SublimeLinter-flow