Add browser to cssnext settings to prevent possible warnings addresses #6

Author: Coobaha

lib/utils.js

@@ -168,6 +168,7 @@ var toConfig = exports.toConfig = (0, _compose2.default)(toExport, toString, obj
 var toES5Config = exports.toES5Config = (0, _compose2.default)(toES5Export, toString, objectify);
 var getPostcss = exports.getPostcss = function getPostcss(async) {
   return (0, _postcss2.default)().use((0, _postcssImport2.default)({ async: async })).use((0, _postcssCssnext2.default)({
+    browsers: ['last 2 versions'],
     features: { customProperties: { preserve: 'computed' }, customMedia: { preserve: true } }
   }));
 };

src/lib/utils.js

@@ -147,6 +147,7 @@ export const getPostcss = async =>
     .use(atImport({ async }))
     .use(
       cssnext({
+        browsers: ['last 2 versions'],
         features: { customProperties: { preserve: 'computed' }, customMedia: { preserve: true } }
       })
     )