feat: allow U+FF1A as subject prefix separator (#59)

Author: ribru17

corpus/subject.txt

@@ -210,3 +210,16 @@ amend! feat: allow fixup
     (subject_prefix)
     (prefix
       (type))))
+
+================================================================================
+Allow U+FF1A as colon separator
+================================================================================
+feat(hi)：some message
+
+--------------------------------------------------------------------------------
+
+(source
+  (subject
+    (prefix
+      (type)
+      (scope))))

grammar.js

@@ -50,7 +50,7 @@ module.exports = grammar({
         alias($._conventional_type, $.type),
         optional(seq('(', alias(SCOPE, $.scope), ')')),
         optional('!'),
-        ':'
+        alias(/[:\uff1a]/, ':')
       ),
 
     _body_line: ($) =>

src/grammar.json

@@ -242,7 +242,12 @@
           ]
         },
         {
-          "type": "STRING",
+          "type": "ALIAS",
+          "content": {
+            "type": "PATTERN",
+            "value": "[:\\uff1a]"
+          },
+          "named": false,
           "value": ":"
         }
       ]