Update spec references to RFC 8446.

Change-Id: I03095ea46e32d41def4a444ff1c8c41409209294
Reviewed-on: https://chromium-review.googlesource.com/1185972
Reviewed-by: Steven Valdez <svaldez@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#585486}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 3889cfb9917e9714fd95c57e844c746a0b6a03e2
diff --git a/patches/tls13_intolerance.patch b/patches/tls13_intolerance.patch
index 6f19571..ef50fed 100644
--- a/patches/tls13_intolerance.patch
+++ b/patches/tls13_intolerance.patch
@@ -6,7 +6,7 @@
      signed_cert_timestamps = 18  # RFC 6962
      extended_master_secret = 23  # RFC 7627
      token_binding = 24           # draft-ietf-tokbind-negotiation
-+    supported_versions = 43      # draft-ietf-tls-tls13-18
++    supported_versions = 43      # RFC 8446
      tack = 0xF300
      supports_npn = 13172
      channel_id = 30032
diff --git a/tlslite/constants.py b/tlslite/constants.py
index 8fb75d0..bac05c2 100644
--- a/tlslite/constants.py
+++ b/tlslite/constants.py
@@ -58,7 +58,7 @@
     signed_cert_timestamps = 18  # RFC 6962
     extended_master_secret = 23  # RFC 7627
     token_binding = 24           # draft-ietf-tokbind-negotiation
-    supported_versions = 43      # draft-ietf-tls-tls13-18
+    supported_versions = 43      # RFC 8446
     tack = 0xF300
     supports_npn = 13172
     channel_id = 30032