Release v0.20.0 (#1900)

diff --git a/version.bzl b/version.bzl
index 6f06d64..2cfaaeb 100644
--- a/version.bzl
+++ b/version.bzl
@@ -1,3 +1,3 @@
 """The version of rules_rust."""
 
-VERSION = "0.19.1"
+VERSION = "0.20.0"