Make postcss a peer. Bump minimatch

Author: Sven Tschui

index.js

@@ -1,6 +1,5 @@
 var postcss = require('postcss');
 var minimatch = require('minimatch');
-var Promise = require('promise');
 var path = require('path');
 
 module.exports = main;

package.json

@@ -23,10 +23,10 @@
   },
   "homepage": "https://github.com/axa-ch/metalsmith-postcss",
   "dependencies": {
-    "minimatch": "^2.0.1",
-    "path": "^0.12.7",
-    "postcss": "^5.0.4 || ^6.0.0",
-    "promise": "^7.0.4"
+    "minimatch": "^3.0.4"
+  },
+  "peerDependencies": {
+    "postcss": "^5.0.4 || ^6.0.0"
   },
   "devDependencies": {
     "assert-dir-equal": "^1.0.1",

test/index.js

@@ -52,10 +52,6 @@ describe('metalsmith-postcss', function () {
         });
     });
 
-    it('should rename sourcemap files');
-
-    it('should find and use previous sourcemaps');
-
     it('should pass absolute paths to postcss', function (done) {
       var metalsmith = Metalsmith(fixture('use-absolute-paths'));
       metalsmith