Fixed missing bzl sources from bzl filegroup (#712)

python/BUILD

diff --git a/python/BUILD b/python/BUILD
index 74c2c1c..05cc9d1 100644
--- a/python/BUILD
+++ b/python/BUILD
@@ -46,6 +46,8 @@
         "defs.bzl",
         "packaging.bzl",
         "pip.bzl",
+        "repositories.bzl",
+        "versions.bzl",
         "//python/pip_install:bzl",
         "//python/private:bzl",
     ],