drop python3.4

Author: aabmass

.circleci/config.yml

@@ -109,4 +109,4 @@ workflows:
           name: tests-python3.<< matrix.python3_minor >>
           matrix:
             parameters:
-              python3_minor: [4, 5, 6, 7, 8]
+              python3_minor: [5, 6, 7, 8]

tox.ini

@@ -3,7 +3,7 @@ skipsdist = True
 skip_missing_interpreters = True
 envlist =
   ; Add the `ci` factor to any env that should be running during CI.
-  py3{4,5,6,7,8}-ci-test-{exporter,tools}-google-cloud
+  py3{5,6,7,8}-ci-test-{exporter,tools}-google-cloud
 
   ; These are development commands and use the same virtualenv.
   dev