fix: use changelogOpts as the base for parserOpts (conventional-changelog#341)

Author: ElliotChong

@commitlint/parse/src/index.js

@@ -4,10 +4,10 @@ import defaultChangelogOpts from 'conventional-changelog-angular';
 export default parse;
 
 async function parse(message, parser = sync, parserOpts) {
-	if (!parserOpts || Object.keys(parserOpts || {}).length === 0) {
-		const changelogOpts = await defaultChangelogOpts;
-		parserOpts = changelogOpts.parserOpts;
-	}
+	const changelogOpts = await defaultChangelogOpts;
+	
+	// Use `changelogOpts` as the base options
+	parserOpts = Object.assign({}, changelogOpts, parserOpts);
 
 	const parsed = parser(message, parserOpts);
 	parsed.raw = message;