[bugfix] fixes the requirement.txt to use correct package names.

requirements.txt

 #DO NOT MODIFY: this file is auto-generated by requirements.py
 six==1.11.0
-zmq==17.1.2
-yaml==3.13
+pyzmq==17.1.2
+PyYAML==3.13
 tornado==5.1
 numpy==1.15.1
 argparse==1.1

test/requirements.py

@@ -23,8 +23,8 @@ import jsonschema
 
 print("#DO NOT MODIFY: this file is auto-generated by requirements.py")
 print("six==%s" % six.__version__)
-print("zmq==%s" % zmq.__version__)
-print("yaml==%s" % yaml.__version__)
+print("pyzmq==%s" % zmq.__version__)
+print("PyYAML==%s" % yaml.__version__)
 print("tornado==%s" % tornado.version)
 print("numpy==%s" % numpy.__version__)
 print("argparse==%s" % argparse.__version__)