fix: correct classifiers in setup.py (#107)

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Follow-up to googleapis/python-bigquery-sqlalchemy#92 🦕

Author: tswast

packages/sqlalchemy-bigquery/setup.py

@@ -53,7 +53,8 @@ def readme():
     classifiers=[
         release_status,
         "Intended Audience :: Developers",
-        "License :: OSI Approved :: MIT License" "Programming Language :: Python",
+        "License :: OSI Approved :: MIT License",
+        "Programming Language :: Python",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",