Update README with latest version 4.5 (#802)

README.md

diff --git a/README.md b/README.md
index 404def3..ec5be8d 100644
--- a/README.md
+++ b/README.md
@@ -73,8 +73,8 @@
 ```python
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
-RULES_JVM_EXTERNAL_TAG = "4.2"
-RULES_JVM_EXTERNAL_SHA = "cd1a77b7b02e8e008439ca76fd34f5b07aecb8c752961f9640dea15e9e5ba1ca"
+RULES_JVM_EXTERNAL_TAG = "4.5"
+RULES_JVM_EXTERNAL_SHA = "b17d7388feb9bfa7f2fa09031b32707df529f26c91ab9e5d909eb1676badd9a6"
 
 http_archive(
     name = "rules_jvm_external",