Change version to 1.20.0 (#2757)

[skip ci] Skipping Travis. Version number change only
diff --git a/version.go b/version.go
index 07dfdb4..50f823c 100644
--- a/version.go
+++ b/version.go
@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.20.0-dev"
+const Version = "1.20.0"