feat(packaging): add support for Python 3.8 (#569)

Release-As: 1.20.0

Closes #568

Author: tseaver

packages/google-auth/docs/reference/google.auth.compute_engine.rst

@@ -10,5 +10,6 @@ Submodules
 ----------
 
 .. toctree::
+   :maxdepth: 4
 
    google.auth.compute_engine.credentials

packages/google-auth/docs/reference/google.auth.crypt.rst

@@ -10,6 +10,7 @@ Submodules
 ----------
 
 .. toctree::
+   :maxdepth: 4
 
    google.auth.crypt.base
    google.auth.crypt.es256

packages/google-auth/docs/reference/google.auth.rst

@@ -10,6 +10,7 @@ Subpackages
 -----------
 
 .. toctree::
+   :maxdepth: 4
 
    google.auth.compute_engine
    google.auth.crypt
@@ -19,6 +20,7 @@ Submodules
 ----------
 
 .. toctree::
+   :maxdepth: 4
 
    google.auth.app_engine
    google.auth.credentials

packages/google-auth/docs/reference/google.auth.transport.rst

@@ -10,7 +10,9 @@ Submodules
 ----------
 
 .. toctree::
+   :maxdepth: 4
 
    google.auth.transport.grpc
+   google.auth.transport.mtls
    google.auth.transport.requests
    google.auth.transport.urllib3

packages/google-auth/docs/reference/google.oauth2.rst

@@ -10,6 +10,7 @@ Submodules
 ----------
 
 .. toctree::
+   :maxdepth: 4
 
    google.oauth2.credentials
    google.oauth2.id_token

packages/google-auth/docs/reference/google.rst

@@ -10,6 +10,7 @@ Subpackages
 -----------
 
 .. toctree::
+   :maxdepth: 4
 
    google.auth
    google.oauth2

packages/google-auth/noxfile.py

@@ -64,7 +64,7 @@ def blacken(session):
     session.run("black", *BLACK_PATHS)
 
 
-@nox.session(python=["2.7", "3.5", "3.6", "3.7"])
+@nox.session(python=["2.7", "3.5", "3.6", "3.7", "3.8"])
 def unit(session):
     session.install(*TEST_DEPENDENCIES)
     session.install(".")

packages/google-auth/setup.py

@@ -56,6 +56,7 @@
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
         "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: Apache Software License",