Merge pull request #273 from izhangxm/master

修复clash规则头部有注释的情况下规则转换功能失败的问题

backend/src/core/rule-utils/preprocessors.js

@@ -8,7 +8,7 @@ function HTML() {
 
 function ClashProvider() {
     const name = 'Clash Provider';
-    const test = (raw) => raw.indexOf('payload:') === 0;
+    const test = (raw) => /^payload:/gm.exec(raw).index >= 0;
     const parse = (raw) => {
         return raw.replace('payload:', '').replace(/^\s*-\s*/gm, '');
     };