v3.1.5 release

This release add a new syntax keyword mermaid, see more details #15

v3.1.4 release

remove the imp dependency.

v3.1.3 release

fix #13

v3.1.2 release

fix bugs when the passage has unicode characters

v3.1.1 release

fix the bug when use python3

v3.1.0 release

1. fix bug when the flowchart is not rendered.
2. simplify the configuration.

v3.0.3 release

modify unicode(utf-8) support python3

v3.0.2 release

remove warning when vim uses python3.

v3.0.1 release

1. upgrade the Commark-py to the newest version.
2. remove the warning when preview unicode files.

v3.0.0 release

1. CommonMark Syntax Support
2. Bug fixes