feat(ensure): modify enum to support regular expression

@commitlint/ensure/src/enum.test.ts

@@ -44,3 +44,13 @@ test('false for c against a, b', () => {
 	const actual = ensure('c', ['a', 'b']);
 	expect(actual).toBe(false);
 });
+
+test('false for ensure/enum against ensure, cli', () => {
+	const actual = ensure('ensure/enum', ['ensure', 'cli']);
+	expect(actual).toBe(true);
+});
+
+test('true for ensure/enum against /ensure\/*/, /cli\/*/', () => {
+	const actual = ensure('ensure/enum', [/ensure\/*/, /cli\/*/]);
+	expect(actual).toBe(true);
+});

@commitlint/ensure/src/enum.ts

@@ -5,5 +5,11 @@ export default (value: any, enums: any[] = []): boolean => {
 	if (!Array.isArray(enums)) {
 		return false;
 	}
-	return enums.indexOf(value) > -1;
+	return enums.reduce((last, curr) => {
+		if (curr instanceof RegExp) {
+			return last || value.search(curr) !== -1;
+		} else {
+			return last || value === curr;
+		}
+	}, false);
 };