feat: allow custom options for neat_css

https://github.com/jakubpawlowicz/clean-css

README.md

@@ -55,6 +55,9 @@ neat_css:
 - **enable** - Enable the plugin. Defaults to `true`.
 - **logger** - Verbose output. Defaults to `false`.
 - **exclude** - Exclude files. Support wildcard pattern.
+- **level** - Optimization level. Defaults to `2`.
+
+For more options, see 
 
 ----------
 

index.js

@@ -19,6 +19,7 @@ if (hexo.config.neat_enable === true) {
   hexo.config.neat_css = Object.assign({
     enable: true,
     logger: false,
+    level: 2,
     exclude: ['*.min.css']
   }, hexo.config.neat_css)
 

lib/filter.js

@@ -45,7 +45,7 @@ function logicCss (str, data) {
   }
 
   return new Promise(function (resolve, reject) {
-    new CleanCSS({ level: 2 }).minify(str, function (err, result) {
+    new CleanCSS(options).minify(str, function (err, result) {
       if (err) return reject(err)
       let saved = ((str.length - result.styles.length) / str.length * 100).toFixed(2)
       resolve(result.styles)