fix negate patterns not working - fixes #1

by using multimatch https://github.com/sindresorhus/multimatch

index.js

@@ -1,7 +1,7 @@
 'use strict';
 var gutil = require('gulp-util');
 var through = require('through');
-var minimatch = require('minimatch');
+var multimatch = require('multimatch');
 
 module.exports = function (pattern) {
 	pattern = typeof pattern === 'string' ? [pattern] : pattern;
@@ -15,18 +15,7 @@ module.exports = function (pattern) {
 			return this.emit('error', new PluginError('gulp-filter', 'Streaming not supported'));
 		}
 
-		var match = false;
-
-		if (typeof pattern === 'function') {
-			match = pattern(file);
-		} else {
-			for (var i = 0; i < pattern.length; i++) {
-				if (minimatch(file.path, pattern[i])) {
-					match = true;
-					break;
-				}
-			}
-		}
+		var match = typeof pattern === 'function' ? pattern(file) : multimatch(file.path, pattern).length > 0;
 
 		if (match) {
 			return this.queue(file);

package.json

@@ -32,7 +32,7 @@
   "dependencies": {
     "gulp-util": "~2.2.0",
     "through": "~2.3.4",
-    "minimatch": "~0.2.14"
+    "multimatch": "~0.1.0"
   },
   "devDependencies": {
     "mocha": "*"

readme.md

@@ -42,7 +42,7 @@ gulp.task('default', function () {
 
 Type: `String`|`Array`|`Function`
 
-Accepts a string/array with globbing patterns which are run through [minimatch](https://github.com/isaacs/minimatch).
+Accepts a string/array with globbing patterns which are run through [multimatch](https://github.com/sindresorhus/multimatch).
 
 If you supply a function you'll get a [vinyl file object](https://github.com/wearefractal/vinyl#file) as the first argument and you're expected to return true/false whether to include the file:
 
@@ -52,7 +52,6 @@ filter(function (file) {
 });
 ```
 
-
 ### filter.end()
 
 Resets the filter and brings back the previously filtered out files.