[epiphany] sync: Update README

[Gabriel Ivașcu <gabrielivascu src gnome org>]

commit c0661aa671c224b462b23161d7a75a112619a4c7
Author: Gabriel Ivascu <gabrielivascu gnome org>
Date:   Sun Dec 3 13:56:42 2017 +0200

    sync: Update README

 lib/sync/README |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/lib/sync/README b/lib/sync/README
index 891766f..cfc53da 100644
--- a/lib/sync/README
+++ b/lib/sync/README
@@ -442,9 +442,6 @@
       Hawk requests. Unfortunately, there isn't any C library for creating Hawk
       headers so the code has been reproduced from a Python library [19].
 
-  Until Nettle adds support for HKDF, Epiphany will use its own implementation
-  of HKDF.
-
   V. EphySyncDebug
 
   EphySyncDebug is a helper module for debugging purposes. All its functions