tower-lsp 0.9.1

Added

• Implement support for the following client-to-server messages:
  • textDocument/documentColor
  • textDocument/colorPresentation
  • textDocument/rangeFormatting
  • textDocument/onTypeFormatting
  • textDocument/foldingRange

Changed

• Server will accept the initialize request from the client only once and will
  respond with JSON-RPC error code -32600 if sent again (PR #160).

Fixed

• Fix broken links and improve documentation (PRs #152 #157 #158).