v0.3.6

Update dependencies and doc.

v0.3.5

Fix #7. Thanks to @hplc.

v0.3.4

Optimize code.

v0.3.3

Fix #3 thanks to @zhongning7924.

v0.3.2

Optimize code for better performance.

v0.3.1

Optimize doc.

v0.3.0

Optimize code for clearer project structure.

v0.2.2

Optimize code.

v0.2.1

Optimize code and doc.

v0.2.0

Optimize code for better performance.
Fix some bugs.