Update README to point to latest release (#169)

Author: sanju-naik

README.md

@@ -155,9 +155,9 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_jar")
 http_jar(
     name = "bazel_diff",
     urls = [
-        "https://github.com/Tinder/bazel-diff/releases/download/4.0.5/bazel-diff_deploy.jar",
+        "https://github.com/Tinder/bazel-diff/releases/download/4.3.0/bazel-diff_deploy.jar",
     ],
-    sha256 = "59f2a614f90b4c2a6c83f1e6146d8722dfaac3a1d8f42734dcbb6ccf373a1cbd",
+    sha256 = "9c4546623a8b9444c06370165ea79a897fcb9881573b18fa5c9ee5c8ba0867e2",
 )
 ```