CORD-1597: Version plyxproto package requirement to pypi package version

Change-Id: Ic8e027870a3de7042e9ae87c00b788c68965203f
diff --git a/containers/xos/pip_requirements.txt b/containers/xos/pip_requirements.txt
index 95983c4..f2f0fd3 100644
--- a/containers/xos/pip_requirements.txt
+++ b/containers/xos/pip_requirements.txt
@@ -168,4 +168,4 @@
 zope.interface==4.3.3
 redis==2.10.5
 astunparse==1.5.0
-git+https://github.com/sb98052/plyprotobuf@cee0402b1d8e3c261be789de43aaa8d56b78e743
+plyxproto==2.1.0