Merge pull request previm#209 from previm/fix-ci

Remove AppVeyor and Travis CI and add GitHub Actions

Merge pull request previm#204 from KSR-Yasuda/bugfix/LocalLinkForInPa…

…geAnchor

Fix in-page anchor link target has come to be wrong in local file link support

Merge pull request previm#195 from beckorz/feature/show-code-language

Support for language display of code blocks

Merge pull request previm#101 from previm/release-1.8.1

Release 1.8.1

Merge pull request previm#93 from previm/multi-preview

Multi preview

Merge pull request previm#39 from kannokanno/hidden-header

add setting of hidden header

Merge pull request previm#38 from kannokanno/support-mermaid

Support mermaid

update help

README修正

fix previm#1

* previm-function.jsのエンコードを指定