remove autoprefixer and let cssnano handle it for me

package.json

@@ -8,7 +8,6 @@
     "browser-sync": "^2.10.1",
     "del": "^2.2.0",
     "eslint-config-google": "^0.3.0",
-    "gulp-autoprefixer": "^3.1.0",
     "gulp-babel": "^6.1.1",
     "gulp-cssnano": "^2.0.0",
     "gulp-eslint": "^1.1.1",

src/registries/style.js

@@ -1,23 +1,26 @@
 import util from 'util';
-import autoprefixer from 'gulp-autoprefixer';
 import nano from 'gulp-cssnano';
 import Registry from 'undertaker-registry';
 import size from 'gulp-size';
 import sourcemaps from 'gulp-sourcemaps';
 import through from 'through2';
 
-const autoprefixerConfig = [
-  'ie >= 10',
-  'ie_mob >= 10',
-  'ff >= 30',
-  'chrome >= 34',
-  'safari >= 7',
-  'opera >= 23',
-  'ios >= 7',
-  'android >= 4.4',
-  'bb >= 10'
-];
-const nanoConfig = {};
+const nanoConfig = {
+  autoprefixer: {
+    add: true,
+    browsers: [
+      'ie >= 10',
+      'ie_mob >= 10',
+      'ff >= 30',
+      'chrome >= 34',
+      'safari >= 7',
+      'opera >= 23',
+      'ios >= 7',
+      'android >= 4.4',
+      'bb >= 10'
+    ]
+  }
+};
 const sourcemapsConfig = ['.', {}];
 
 /**
@@ -55,10 +58,8 @@ function StyleRegistry(config = {}) {
 
     return taker.src(paths.styles, {base: paths.app})
       .pipe(preprocess())
-      .pipe(autoprefixer(autoprefixerConfig))
       .pipe(sourcemaps.init())
       .pipe(nano(nanoConfig))
-      .pipe(sourcemaps.init())
       .pipe(sourcemaps.write(...sourcemapsConfig))
       .pipe(postprocess())
       .pipe(size({title: 'styles'}))