falcon: Drop support for Python 3.4

Remove unwanted support for Python versions <3.6.
This integration mistakenly lists Python 3.4 support, because it was
merged in
open-telemetry/opentelemetry-python#1039,
after the merge of
open-telemetry/opentelemetry-python#1099, so the
latter didn't consider `falcon`.

Python 3.4 is broken nevertheless, as this integration already includes
f-strings and other `opentelemetry` dependencies, which require Python 3.6.

Fixes open-telemetry#772.

Author: adamantike

instrumentation/opentelemetry-instrumentation-falcon/setup.cfg

@@ -28,14 +28,13 @@ classifiers =
     License :: OSI Approved :: Apache Software License
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.4
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
 
 [options]
-python_requires = >=3.4
+python_requires = >=3.6
 package_dir=
     =src
 packages=find_namespace:

tox.ini

@@ -46,7 +46,7 @@ envlist =
     pypy3-test-instrumentation-elasticsearch{2,5,6}
 
     ; opentelemetry-instrumentation-falcon
-    py3{4,5,6,7,8,9}-test-instrumentation-falcon{2,3}
+    py3{6,7,8,9}-test-instrumentation-falcon{2,3}
     pypy3-test-instrumentation-falcon{2,3}
 
     ; opentelemetry-instrumentation-fastapi
@@ -258,7 +258,7 @@ commands_pre =
   test: pip install "opentelemetry-semantic-conventions[test] @ {env:CORE_REPO}#egg=opentelemetry-semantic-conventions&subdirectory=opentelemetry-semantic-conventions"
   test: pip install "opentelemetry-sdk[test] @ {env:CORE_REPO}#egg=opentelemetry-sdk&subdirectory=opentelemetry-sdk"
   test: pip install "opentelemetry-test[test] @ {env:CORE_REPO}#egg=opentelemetry-test&subdirectory=tests/util"
-  test: pip install {toxinidir}/opentelemetry-instrumentation 
+  test: pip install {toxinidir}/opentelemetry-instrumentation
 
   distro: pip install {toxinidir}/opentelemetry-distro