Merge branch 'release/0.2.14' into develop

* release/0.2.14:
  update version
add negative numbers to english
update version
Merge branch 'release/0.2.15'

* release/0.2.15:
  update version
  add negative numbers to english
fix readme
Merge branch 'hotfix/fix_readme'

* hotfix/fix_readme:
  fix readme