fix: remove union typedef (#28)

BREAKING CHANGE: The `union` type has been removed from
the WIT grammar.


Unions were
[removed](WebAssembly/component-model#237) from
WIT and the Component Model recently.

Signed-off-by: Till Schneidereit <till@tillschneidereit.net>

src/extension.ts

@@ -37,7 +37,6 @@ const keywords = [
  "resource",
  "static",
  "type",
- "union",
  "use",
  "variant",
  "with",

syntaxes/wit.tmLanguage.json

@@ -577,9 +577,6 @@
  {
  "include": "#record"
  },
- {
- "include": "#union"
- },
  {
  "include": "#flags"
  },
@@ -897,42 +894,6 @@
  }
  ]
  },
- "union": {
- "name": "meta.union-items.wit",
- "comment": "Syntax for WIT like `union \"id\" {`",
- "begin": "\\s*\\b(union)\\b\\s+((?<![\\-\\w])([a-z][0-9a-z]*|[A-Z][0-9A-Z]*)(([\\-])([a-z][0-9a-z]*|[A-Z][0-9A-Z]*))*)\\s*(\\{)\\s*",
- "beginCaptures": {
- "1": {
- "name": "keyword.other.union.union-items.wit"
- },
- "2": {
- "name": "entity.name.type.declaration.id.union-items.wit"
- },
- "7": {
- "name": "punctuation.brackets.curly.begin.wit"
- }
- },
- "patterns": [
- {
- "include": "#comment"
- },
- {
- "name": "meta.types.union-cases.wit",
- "include": "#types"
- },
- {
- "name": "punctuation.comma.wit",
- "match": "\\s*(\\,)"
- }
- ],
- "end": "\\s*(\\})\\s*",
- "applyEndPatternLast": 1,
- "endCaptures": {
- "1": {
- "name": "punctuation.brackets.curly.end.wit"
- }
- }
- },
  "types": {
  "name": "meta.ty.wit",
  "comment": "Syntax for WIT types corresponding to the interface types specification",