Breaking changes

1. - fetchImages('catgirl');
   + fetchCategoryImages('catgirl');

2. - fetchImages({ session: 'ip', count: 1, additionalTags: ['cute', 'blue-hair'], blacklistedTags: ['yellow-hair'] });
   + fetchImages({ session: 'ip', count: 1, tags: ['cute', 'blue-hair'], blacklist: ['yellow-hair'] });

Added

1. fetchTags()
2. fetchById()

Changed

1. fetchShadowImages() now works the same way as fetchImages().
2. Updated tags.
3. Updated types.
4. Other quality fixes.

Full Changelog: v0.1.5...v0.2.0