1.0.1 (2015-09-27)
Improve document.
1.0.0 (2015-09-27)
Add yard document.
0.3.1 (2015-09-26)
Update document.
0.3.0 (2015-09-26)
Drop #natural_number_string?.
Use #positive_integer_string? or zero_or_positive_integer_string?.
- natural_number: natural_number_string? is not clear (bdd8a4c)
0.2.1 (2015-09-26)
- positive: add positive_integer_string? (69ecf8a)
- zero-or-positive: add zero_or_positive_integer_string? (6d3c46b)
0.2.0 (2015-09-26)
- natural_number_string: change api (5501b2b)
- natural-number: implement natural number (49e7dc0)