Update the version to 0.50.0 and remove the draft tag

In preparation for the 0.50.0 release

Signed-off-by: Eric Kunze <eric.kunze@arm.com>
Change-Id: Ib7cda8120da40daef4c99e4614e62734512988c3
diff --git a/Makefile b/Makefile
index 23063db..a0d1056 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@
 # by a licensing agreement from ARM Limited.
 #
 
-TOSAREVISION=0.41.0 draft
+TOSAREVISION=0.50.0
 MKDIR=mkdir -p
 ASCIIDOC=asciidoctor
 ASPELL=aspell