fix: typo

Author: ulivz

lib/util/parseHeaders.js

@@ -19,8 +19,8 @@ const removeMarkdownToken = str => str
 
 // put here to avoid circular references
 const compose = (...processors) => {
-  if (processors.length === 0) input => input
-  if (processors.length === 1) processors[0]
+  if (processors.length === 0) return input => input
+  if (processors.length === 1) return processors[0]
   return processors.reduce((prev, next) => {
     return (...args) => next(prev(...args))
   })