Update README to remove v2.50 documentation note

Removed note about ongoing documentation for v2.50.
diff --git a/README.md b/README.md
index 603c8dc..832eeb4 100644
--- a/README.md
+++ b/README.md
@@ -6,8 +6,6 @@
 
 [![Build status](https://img.shields.io/appveyor/build/BinomialLLC/basis-universal/master.svg)](https://ci.appveyor.com/project/BinomialLLC/basis-universal)
 
-*Note: v2.50 has just been merged into the repo, but the documentation work for this release is still ongoing.*
-
 ----
 
 Intro