Merge branch 'po/gnuts-doc' into 'master'

Bump minimal version required for GNUTLS.

See merge request eng/toolchain/aws!46

Author: TurboGit

readme.txt

@@ -119,7 +119,7 @@ LibreSSL (optional):
 GNUTLS (optional):
 
    You need to install manually the development libraries. AWS needs at
-   least version 3.2.4 of GNUTLS.
+   least version 3.4.6 of GNUTLS.
 
 OpenLDAP library (optional) :