get ready for a new release 2.0.6

[fdncred]

• 2.0.6 Release
  • Update grammar command list for nushell 0.116.0 #239
  • Fix grammar for filesize units, string escapes, negative timezone offsets, table<>/oneof<> types, redirection operators, 0b[]/0o[] literals, and $in #239
  • Highlight ```nu code blocks in markdown #239
  • Fix language server start/stop commands, fall back to nu on PATH when the configured executable is missing, and remove settings that nu --lsp never used #239
  • Remove snippets for commands that no longer exist and fix export-env #239
  • Rewrite e2e tests against nu --lsp and fix generate-patterns.nu/generate-example.nu for current nushell #239
  • Syntax highlighting broken for record keys containing brackets #232
  • Syntax highlighting broken for variable declarations with type annotations #234
  • Syntax highlighting broken for bare string values in records #237