fix: ignore osome files for coverage

src/commitizen.js

@@ -1,3 +1,4 @@
+/* istanbul ignore file */
 import * as adapter from './commitizen/adapter';
 import * as cache from './commitizen/cache';
 import commit from './commitizen/commit';

src/configLoader.js

@@ -1,3 +1,4 @@
+/* istanbul ignore file */
 import findup from './configLoader/findup';
 import getContent from './configLoader/getContent';
 import getNormalizedConfig from './configLoader/getNormalizedConfig';

src/git.js

@@ -1,3 +1,4 @@
+/* istanbul ignore file */
 import { addPath, addFile } from './git/add';
 import { commit } from './git/commit';
 import { init } from './git/init';