Bump the version (#309)

Bump generator version to 0.16 and required python version of the generated surface to 3.6

Author: software-dov

packages/gapic-generator/gapic/templates/setup.py.j2

@@ -21,7 +21,7 @@ setuptools.setup(
         'grpcio >= 1.10.0',
         'proto-plus >= 0.4.0',
     ),
-    python_requires='>={% if opts.lazy_import %}3.7{% else %}3.5{% endif %}',{# Lazy import requires module-level getattr #}
+    python_requires='>={% if opts.lazy_import %}3.7{% else %}3.6{% endif %}',{# Lazy import requires module-level getattr #}
     setup_requires=[
         'libcst >= 0.2.5',
     ],

packages/gapic-generator/setup.py

@@ -25,7 +25,7 @@
 
 setup(
     name='gapic-generator',
-    version='0.15.0',
+    version='0.16.0',
     license='Apache 2.0',
     author='Luke Sneeringer',
     author_email='[email protected]',