v0.0.20

• Break change: :CocDisable disabled all events from vim.
• Break change: new snippet implementation.
  • Support multiple line snippet.
  • Support VSCode snippet extension.
  • Support completion of snippets from snippet extension.
• Add highlight groups for different severity.
• Add coc.preferences.formatOnType option.
• Add coc.preferences.snippets.enable option.
• Fix snippet not works as insertText.
• Fix echo message with multiple lines.
• Fix signatureHelp with showcmd disabled.
• Fix location list cleared on :lopen.
• Fix diagnostic info not cleared on :CocDisable
• Fix diagnostic info not cleared on buffer unload.
• Fix buffer highlight not cleared on highlight action.
• Fix format on type not work as expected.