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* rewrite logger

* feat: add demo

* bump frontend 2.0.0-beta.50

* fix: nodejs 12.x compatibility

* chore: update dependencies

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* feat: graph supports vertical and horizontal direction

* chore: update dependencies

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* fix: step slider shrink in pr-curve page

* chore: update dependencies

* feat: add api token key to support vdl-service

* fix: do not fetch unused steps of runs in pr-curve page

* fix: error when switch to overlay mode in histogram page

* feat: pr-curve show all matched points in tooltip

* fix: sample rate display error

* bump 2.0.0-beta.8

* feat: decode mp3 audio sample rate

* fix: compatibility of safari

* chore: use shared audio context to decrease memory usage

* fix: chinese translation

* fix: formalize volumn slider in different browser

* fix: display error when chart maximized

* fix: get sample rate from wav raw

* feat: add sample indicator in sample pages

* fix: use query string to disable font cache

* rename pages to remove trailing 's'

* feat: navbar support dropdown menu

* feat: audio sample page

* chore: update dependencies

* style: fix lint

* v2.0.0-beta.46

* chore: fix import method

* v2.0.0-beta.47

* chore: remove unused code

* v2.0.0-beta.48

* fix: navbar submenu overflow when hover

* v2.0.0-beta.49

* build: remove protobufjs dependency

* chore: support runtime config

* v2.0.0-beta.44

* fix: api url build config

* v2.0.0-beta.45

* fix: give up runtime config

* fix code style

* use publicPath config in i18n

* fix python app typo

* VisualDL User Guide-English Version

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