Merge pull request #46 from jac-stripe/jac/splits

Split the extras param by comma

python/whl.bzl

diff --git a/python/whl.bzl b/python/whl.bzl
index 7a19947..45c08d5 100644
--- a/python/whl.bzl
+++ b/python/whl.bzl
@@ -24,7 +24,10 @@
   ]
 
   if repository_ctx.attr.extras:
-    args += ["--extras", ",".join(repository_ctx.attr.extras)]
+    args += [
+      "--extras=%s" % extra
+      for extra in repository_ctx.attr.extras
+    ]
 
   result = repository_ctx.execute(args)
   if result.return_code: