fix(deps): require protobuf>=3.19.0,<4.0.0 on v0 branch (#211)

* fix(deps): require protobuf>=3.19.0,<4.0.0 on v0 branch

* chore: set up CI

noxfile.py

@@ -23,26 +23,31 @@
 import nox
 
 
+DEFAULT_PYTHON_VERSION = "3.8"
+
 BLACK_VERSION = "black==19.3b0"
 BLACK_PATHS = ["docs", "google", "tests", "noxfile.py", "setup.py"]
 
 if os.path.exists("samples"):
     BLACK_PATHS.append("samples")
 
+# Error if a python version is missing
+nox.options.error_on_missing_interpreters = True
+
 
-@nox.session(python="3.7")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def lint(session):
     """Run linters.
 
     Returns a failure if the linters find linting errors or sufficiently
     serious code quality issues.
     """
-    session.install("flake8", BLACK_VERSION)
+    session.install("flake8", BLACK_VERSION, "click<8.1.0")
     session.run("black", "--check", *BLACK_PATHS)
     session.run("flake8", "google", "tests")
 
 
-@nox.session(python="3.6")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def blacken(session):
     """Run black.
 
@@ -52,11 +57,11 @@ def blacken(session):
     That run uses an image that doesn't have 3.6 installed. Before updating this
     check the state of the `gcp_ubuntu_config` we use for that Kokoro run.
     """
-    session.install(BLACK_VERSION)
+    session.install(BLACK_VERSION, "click<8.1.0")
     session.run("black", *BLACK_PATHS)
 
 
-@nox.session(python="3.7")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def lint_setup_py(session):
     """Verify that setup.py is valid (including RST check)."""
     session.install("docutils", "pygments")
@@ -120,7 +125,7 @@ def system(session):
         session.run("py.test", "--quiet", system_test_folder_path, *session.posargs)
 
 
-@nox.session(python="3.7")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def cover(session):
     """Run the final coverage report.
 
@@ -133,12 +138,12 @@ def cover(session):
     session.run("coverage", "erase")
 
 
-@nox.session(python="3.7")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def docs(session):
     """Build the docs for this library."""
 
     session.install("-e", ".")
-    session.install("sphinx<3.0.0", "alabaster", "recommonmark")
+    session.install("sphinx<3.0.0", "jinja2<3.1", "alabaster", "recommonmark")
 
     shutil.rmtree(os.path.join("docs", "_build"), ignore_errors=True)
     session.run(

setup.py

@@ -26,6 +26,7 @@
 release_status = "Development Status :: 4 - Beta"
 dependencies = [
     "google-api-core[grpc] >= 1.31.5, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.0",
+    "protobuf >= 3.19.0, <4.0.0dev",
     'enum34; python_version < "3.4"',
 ]