QDates v0.3.0

Significant change in internal implementation

• Removed the dependency on qref.c, and Reimplemented with Pure Julia
• Performance improvement
• Add support for 32-bit Windows and other platforms

Specification change

• Expand available dates (旧445年1月1日 to 旧2200年12月29日) (previously the max date is 旧2100年12月1日)

QDates.jl v0.2.0

Adjust for Julia v1.0.0 or later(ready for v"1.1")

• Drop Julia v0.6 support
• Remove dependency on Compat.jl
• Add/Fix tests