Add `change` listeners to `Text` nodes
Add new database; add emoji-emotion as a dev-dependency
Add test for `Text` nodes with valence
Refactor useage in `Readme.md` to contain negation
Refactor `Readme.md` to contain emoji
Refactor `Readme.md` to contains info on calculated polarity
Merge branch 'feature/support-non-word-valence'
Add test for polarity injection
Add polarity injection to module
Add polarity injection useage and description to `Readme.md`
Merge branch 'feature/add-support-for-injection'
Update changelog for 0.3.0
0.3.0