Remove Python 3.6 as supported version.

Author: decko

instrumentation/opentelemetry-instrumentation-aiohttp-server/pyproject.toml

@@ -18,7 +18,6 @@ classifiers = [
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",