docs: update README to reflect changed algorithm

README.md

@@ -32,7 +32,7 @@ This tiny middleware addresses some of the issues. Specifically, it will change
 the requested location to the index you specify (default being `/index.html`)
 whenever there is a request which fulfills the following criteria:
 
- 1. The request is a GET request
+ 1. The request is a `GET` or `HEAD` request
  2. which accepts `text/html`,
  3. is not a direct file request, i.e. the requested path does not contain a
     `.` (DOT) character and