移除对 sass/scss 的支持 (#125)

* remove support for scss/sass

* update browserslist & caniuse-lite

* upgrade node for Docker image

Author: nighca

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:8.16.1
+FROM node:12.18.2
 LABEL maintainer="[email protected]"
 
 WORKDIR /fec

lib/constants/transforms.js

@@ -6,7 +6,6 @@
 module.exports = {
   css: 'css',
   less: 'less',
-  sass: 'sass',
   stylus: 'stylus',
   babel: 'babel',
   ts: 'ts',

lib/webpack-config/addons/add-transform.js

@@ -260,7 +260,6 @@ module.exports = (
   switch(transform.transformer) {
     case transforms.css:
     case transforms.less:
-    case transforms.sass:
     case transforms.stylus: {
       const { modules, raw } = utils.extend({
         modules: false,