Move Open Source to 19.4.22 to release

Summary: - Release our vendor wheel version that passes for Python 3.7

Reviewed By: terrelln

Differential Revision: D15028271

fbshipit-source-id: 09e6b987b1e6a33912beeec054abef1cfb68d68d

setup.py

@@ -17,7 +17,7 @@ def get_long_description():
 
 setup(
     name="xar",
-    version="18.07.12",
+    version="19.4.22",
     description="The XAR packaging toolchain.",
     long_description=get_long_description(),
     long_description_content_type="text/markdown",