update to v1.5.1

update to v1.5.0

Merge pull request ichord#359 from wbw20/wbw20/zero_width_join

Use zero width join character for better rendering in Chrome

update to v1.4.0

update to v1.3.2

Update to v1.3.1

update to v1.3.0

update to v1.2.0

extend funcations

bugs fix