Merge pull request #37 from hackmdio/release/2.5.0

Release 2.5.0

Merge pull request #40 from hackmdio/copilot/fix-39

Add book mode conference note example with TypeScript implementation

Merge pull request #41 from hackmdio/master

merge master into develop

Merge pull request #38 from hackmdio/chore/prelease

Publish pre-release(beta) build automatically