Replace q-io with fs-extra.

lib/git.js

@@ -1,9 +1,8 @@
 const cp = require('child_process');
 const path = require('path');
 const util = require('util');
-
+const fse = require('fs-extra');
 const Q = require('q');
-const fs = require('q-io/fs');
 
 let git = 'git';
 
@@ -88,11 +87,11 @@ exports.init = function init(cwd) {
  * @return {Promise} A promise.
  */
 exports.clone = function clone(repo, dir, branch, options) {
-  return fs.exists(dir).then(exists => {
+  return fse.pathExists(dir).then(exists => {
     if (exists) {
       return Q.resolve();
     }
-    return fs.makeTree(path.dirname(path.resolve(dir))).then(() => {
+    return fse.ensureDir(path.dirname(path.resolve(dir))).then(() => {
       const args = ['clone', repo, dir, '--branch', branch, '--single-branch'];
       if (options.depth) {
         args.push('--depth', options.depth);
@@ -161,7 +160,7 @@ exports.checkout = function checkout(remote, branch, cwd) {
         return spawn(git, ['checkout', '--orphan', branch], cwd);
       }
       // unhandled error
-      return Q.reject(error);
+      return Promise.reject(error);
     }
   );
 };
@@ -196,7 +195,7 @@ exports.commit = function commit(message, cwd) {
   return spawn(git, ['diff-index', '--quiet', 'HEAD', '.'], cwd)
     .then(() => {
       // nothing to commit
-      return Q.resolve();
+      return Promise.resolve();
     })
     .fail(() => {
       return spawn(git, ['commit', '-m', message], cwd);

package.json

@@ -23,7 +23,6 @@
     "fs-extra": "^9.0.0",
     "graceful-fs": "^4.2.3",
     "q": "^1.5.1",
-    "q-io": "^1.13.6",
     "url-safe": "^2.0.0"
   },
   "devDependencies": {