feat!: update preset interface

BREAKING CHANGE: preset now exports preset config factory function. See conventional-changelog/conventional-changelog#1045.

index.js

@@ -6,11 +6,12 @@ const conventionalChangelogConventionalCommits =
 const commitGroupsSort = require('./lib/commit-groups-compare');
 const transform = require('./lib/commit-transform');
 
-/**
- * @type {Promise<Object>} preset with `parserOpts` and `writerOpts`.
- */
-module.exports = conventionalChangelogConventionalCommits.then((preset) =>
-  _.merge(preset, {
-    writerOpts: { transform, commitGroupsSort, groupBy: 'groupType' },
-  })
-);
+async function createPreset() {
+  return conventionalChangelogConventionalCommits.then((preset) =>
+    _.merge(preset, {
+      writerOpts: { transform, commitGroupsSort, groupBy: 'groupType' },
+    })
+  );
+}
+
+module.exports = createPreset;