fix: Update rollup and postcss plugin

package.json

@@ -44,12 +44,12 @@
     "cypress": "^3.1.1",
     "less": "^3.0.4",
     "node-sass": "^4.9.0",
-    "rollup": "^0.65.0",
+    "rollup": "^1.2.2",
     "rollup-plugin-buble": "^0.19.2",
     "rollup-plugin-commonjs": "^8.3.0",
     "rollup-plugin-multi-entry": "^2.0.2",
     "rollup-plugin-node-resolve": "^3.0.2",
-    "rollup-plugin-postcss": "^1.4.0",
+    "rollup-plugin-postcss": "^2.0.3",
     "rollup-plugin-uglify": "^3.0.0",
     "rollup-plugin-vue": "^4.3.2",
     "vue-template-compiler": "^2.5.17"

rollup/watch.js

@@ -67,7 +67,7 @@ function get_watch_options(app) {
 function log_css_change({output}) {
 	return {
 		name: 'log-css-change',
-		ongenerate() {
+		generateBundle() {
 			if (!output.endsWith('.css')) return null;
 			log('Rebuilding', path.basename(output));
 			return null;