修正：当启用stripIgnoreTagBody时，如果以要过滤的标签开头，会导致前面部分没正确删除[removed]标记

lib/default.js

@@ -278,7 +278,7 @@ function StripTagBody (tags, next) {
   var isRemoveAllTag = !Array.isArray(tags);
   function isRemoveTag (tag) {
     if (isRemoveAllTag) return true;
-    return tags.indexOf(tag) !== -1;
+    return (tags.indexOf(tag) !== -1);
   }
 
   var removeList = [];   // 要删除的位置范围列表
@@ -290,7 +290,7 @@ function StripTagBody (tags, next) {
         if (options.isClosing) {
           var ret = '[/removed]';
           var end = options.position + ret.length;
-          removeList.push([posStart || options.position, end]);
+          removeList.push([posStart !== false ? posStart : options.position, end]);
           posStart = false;
           return ret;
         } else {