add errors codes
add support_negative method
remove function
refactoring tests
add bignumber test for English
add new tests
Merge branch 'feature/up_coverage' into develop

* feature/up_coverage:
  add new tests
  add bignumber test for English
  refactoring tests
  remove function
  add support_negative method
update version
Merge branch 'release/0.2.19' into develop

* release/0.2.19:
  update version