Don't distribute tests.

Also, update Python version numbers and bump our version number.

README.md

@@ -6,7 +6,7 @@ To install:
 
 `pip install mock-firestore`
 
-Python 3.6+ is required for it to work.
+Python 3.9+ is required for it to work.
 
 ## Usage
 
@@ -105,7 +105,7 @@ transaction.commit()
 ```
 
 ## Running the tests
-* Create and activate a virtualenv with a Python version of at least 3.6
+* Create and activate a virtualenv with a Python version of at least 3.9
 * Install dependencies with `pip install -r requirements-dev-minimal.txt`
 * Run tests with `python -m unittest discover tests -t /`
 
@@ -130,3 +130,4 @@ transaction.commit()
 * [William Li](https://github.com/wli)
 * [Ugo Marchand](https://github.com/UgoM)
 * [Bryce Thornton](https://github.com/brycethornton)
+* [Ted Romer](https://github.com/thromer)

setup.py

@@ -5,20 +5,22 @@
 
 setuptools.setup(
     name="mock-firestore",
-    version="0.11.0",
+    version="0.11.1",
     author="Matt Dowds",
     description="In-memory implementation of Google Cloud Firestore for use in tests",
     long_description=long_description,
     long_description_content_type="text/markdown",
     url="https://github.com/mdowds/mock-firestore",
-    packages=setuptools.find_packages(),
+    packages=setuptools.find_packages(exclude=["tests"]),
+    python_requires=">=3.9",
     test_suite='',
     classifiers=[
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         "License :: OSI Approved :: MIT License",
     ],
-)
+)