Add drivetrain_main for 2019 robot

Needs masses and controller still tuned.

Change-Id: I29d62286b2941238abb9770a21e764148fbb688b
diff --git a/y2019/control_loops/python/BUILD b/y2019/control_loops/python/BUILD
index 1b395e5..90aafbc 100644
--- a/y2019/control_loops/python/BUILD
+++ b/y2019/control_loops/python/BUILD
@@ -53,5 +53,5 @@
     name = "python_init",
     srcs = ["__init__.py"],
     visibility = ["//visibility:public"],
-    deps = ["//y2018/control_loops:python_init"],
+    deps = ["//y2019/control_loops:python_init"],
 )