use path-exists module as fs.exists is being deprecated

https://github.com/sindresorhus/path-exists

package.json

@@ -52,6 +52,7 @@
   },
   "devDependencies": {
     "fs-extra": "^0.12.0",
-    "mocha": "*"
+    "mocha": "*",
+    "path-exists": "^1.0.0"
   }
 }

test.js

@@ -1,6 +1,7 @@
 'use strict';
 var assert = require('assert');
 var fs = require('fs-extra');
+var pathExists = require('path-exists');
 var del = require('./');
 
 beforeEach(function () {
@@ -26,50 +27,50 @@ afterEach(function () {
 it('should delete files - async', function (cb) {
 	del(['*.tmp', '!1*'], function (err) {
 		assert(!err, err);
-		assert(fs.existsSync('1.tmp'));
-		assert(!fs.existsSync('2.tmp'));
-		assert(!fs.existsSync('3.tmp'));
-		assert(!fs.existsSync('4.tmp'));
-		assert(fs.existsSync('.dot.tmp'));
+		assert(pathExists.sync('1.tmp'));
+		assert(!pathExists.sync('2.tmp'));
+		assert(!pathExists.sync('3.tmp'));
+		assert(!pathExists.sync('4.tmp'));
+		assert(pathExists.sync('.dot.tmp'));
 		cb();
 	});
 });
 
 it('should delete files - sync', function () {
 	del.sync(['*.tmp', '!1*']);
-	assert(fs.existsSync('1.tmp'));
-	assert(!fs.existsSync('2.tmp'));
-	assert(!fs.existsSync('3.tmp'));
-	assert(!fs.existsSync('4.tmp'));
-	assert(fs.existsSync('.dot.tmp'));
+	assert(pathExists.sync('1.tmp'));
+	assert(!pathExists.sync('2.tmp'));
+	assert(!pathExists.sync('3.tmp'));
+	assert(!pathExists.sync('4.tmp'));
+	assert(pathExists.sync('.dot.tmp'));
 });
 
 it('should take account of options - async', function (cb) {
 	del(['*.tmp', '!1*'], {dot: true}, function (err) {
 		assert(!err, err);
-		assert(fs.existsSync('1.tmp'));
-		assert(!fs.existsSync('2.tmp'));
-		assert(!fs.existsSync('3.tmp'));
-		assert(!fs.existsSync('4.tmp'));
-		assert(!fs.existsSync('.dot.tmp'));
+		assert(pathExists.sync('1.tmp'));
+		assert(!pathExists.sync('2.tmp'));
+		assert(!pathExists.sync('3.tmp'));
+		assert(!pathExists.sync('4.tmp'));
+		assert(!pathExists.sync('.dot.tmp'));
 		cb();
 	});
 });
 
 it('should take account of options - sync', function () {
 	del.sync(['*.tmp', '!1*'], {dot: true});
-	assert(fs.existsSync('1.tmp'));
-	assert(!fs.existsSync('2.tmp'));
-	assert(!fs.existsSync('3.tmp'));
-	assert(!fs.existsSync('4.tmp'));
-	assert(!fs.existsSync('.dot.tmp'));
+	assert(pathExists.sync('1.tmp'));
+	assert(!pathExists.sync('2.tmp'));
+	assert(!pathExists.sync('3.tmp'));
+	assert(!pathExists.sync('4.tmp'));
+	assert(!pathExists.sync('.dot.tmp'));
 });
 
 it('cwd option - sync', function () {
 	var f = 'tmp/tmp.txt';
 	fs.ensureFileSync(f);
 	del.sync('tmp.txt', {cwd: 'tmp'});
-	assert(!fs.existsSync(f));
+	assert(!pathExists.sync(f));
 	fs.remove(f);
 });
 
@@ -79,7 +80,7 @@ it('cwd option - async', function (cb) {
 
 	del('tmp.txt', {cwd: 'tmp'}, function (err) {
 		assert(!err, err);
-		assert(!fs.existsSync(f));
+		assert(!pathExists.sync(f));
 		fs.remove(f);
 		cb();
 	});