Update setup.py (#25)

Remove Python 3.10 classifier
Remove Alpha Classifier
Add Beta Classifier

Author: sdairs

setup.py

@@ -40,13 +40,12 @@
         "impyla"
     ],
     classifiers=[
-        "Development Status :: 3 - Alpha",
+        "Development Status :: 4 - Beta",
         "Operating System :: MacOS :: MacOS X",
         "Operating System :: Microsoft :: Windows",
         "Operating System :: POSIX :: Linux",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
-        "Programming Language :: Python :: 3.10",
         "License :: OSI Approved :: Apache Software License"
     ],
     zip_safe=False