• Break change signature change of workspace.registerKeymap.
• Break change <esc> of CocList can't be remapped any more.
• Break change use yarnpkg command instead of yarn when possible.
• Break change noinsert is removed from completeopt when noselect is
  enabled, <CR> would break line by default.
• Add setting diagnostic.refreshAfterSave.
• Add chinese documentation.
• Add support of multiple line placeholder.
• Fix edit of nested snippet placeholders.
• Fix possible infinite create of documents.
• Fix check for resume completion.