TODO: HTTP/2 "prior knowledge" is implemented!

docs/HTTP2.md

@@ -111,9 +111,3 @@ client can use that hint to create a new connection asynchronously.  For
 libcurl, we may introduce a way to bring such clues to the applicaton and/or
 let a subsequent request use the alternate route
 automatically. [Spec](https://tools.ietf.org/html/draft-ietf-httpbis-alt-svc-14)
-
-TODO
-----
-
-  - Implement "prior-knowledge" HTTP/2 connections over clear text so that
-    curl can connect with HTTP/2 at once without 1.1+Upgrade.

docs/ROADMAP.md

@@ -18,11 +18,6 @@ HTTP/2
    To decide: if we need to bundle parts of the nghttp2 stuff that probably
    won't be shipped by many distros.
 
-- provide option for HTTP/2 "prior knowledge" over clear text
-
-   As it would avoid the roundtrip-heavy Upgrade: procedures when you _know_
-   it speaks HTTP/2.
-
 HTTP cookies
 ------------