fixed typo

Author: Daniel-Mietchen

README.md

@@ -47,7 +47,7 @@ Usage: markdown-toc [--json] [-i] <input>
           (Without this flag, the default is to print the TOC to stdout.)
 ```
 
-## Highights
+## Highlights
 
 **Features**
 
@@ -341,4 +341,4 @@ Released under the [MIT license](LICENSE).
 
 ***
 
-_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.4.1, on January 15, 2017._
+_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.4.1, on January 15, 2017._