setup.py: Introduce janus dependency (Python >= 3.5.3)

.pylintrc

@@ -461,6 +461,7 @@ known-third-party=boto3,
                   enchant,
                   google,
                   grpc,
+                  janus,
                   moto,
                   yaml
 
@@ -524,4 +525,4 @@ valid-metaclass-classmethod-first-arg=mcs
 
 # Exceptions that will emit a warning when being caught. Defaults to
 # "Exception"
-overgeneral-exceptions=Exception
+overgeneral-exceptions=Exception
\ No newline at end of file

setup.py

@@ -112,13 +112,15 @@ setup(
     license="Apache License, Version 2.0",
     description="A remote execution service",
     packages=find_packages(),
+    python_requires='>= 3.5.3',  # janus requirement
     install_requires=[
-        'protobuf',
-        'grpcio',
-        'Click',
-        'PyYAML',
         'boto3 < 1.8.0',
         'botocore < 1.11.0',
+        'click',
+        'grpcio',
+        'janus',
+        'protobuf',
+        'pyyaml',
     ],
     entry_points={
         'console_scripts': [