DOC fix hyperlink changelog 

add developer tools 

bumpversion 0.12.4 

bumpversion 0.12.3 

REL bumpversion 0.12.2 

REL imbalanced-learn 0.12.1 

DOC fix hyperlink 

DOC fix merge conflict 

REL bumpversion to 0.10.1 

REL bumpversion 0.10