Remove outdated note.

docs/provenance.md

@@ -4,13 +4,6 @@ Helm has provenance tools which help chart users verify the integrity and origin
 of a package. Using industry-standard tools based on PKI, GnuPG, and well-respected
 package managers, Helm can generate and verify signature files.
 
-**Note:**
-Version 2.0.0-alpha.4 introduced a system for verifying the authenticity of charts.
-While we do not anticipate that any major changes will be made to the file formats
-or provenancing algorithms, this portion of Helm is not considered _frozen_ until
-2.0.0-RC1 is released. The original plan for this feature can be found
-[at issue 983](https://github.com/kubernetes/helm/issues/983).
-
 ## Overview
 
 Integrity is established by comparing a chart to a provenance record. Provenance