drop Python 3.4 support from CI

.semaphore/build_wheels.sh

@@ -10,6 +10,8 @@ for py in /opt/python/*/bin; do
     # to delete the Poetry virtualenv to avoid skipping a build due to
     # Poetry using the wrong virtualenv.
     rm -rf $HOME/.cache/pypoetry/virtualenvs/hyperscan-py2.7
+  elif [[ "$py" == *"cp34"* ]]; then
+    continue
   fi
   "${py}/pip" install -UI poetry setuptools
   "${py}/pip" wheel \

.semaphore/run_tests.sh

@@ -3,12 +3,10 @@ set -e -x
 
 for whl in wheelhouse/hyperscan-*.whl; do
   python_version=$(expr "$whl" : '.*cp\(.*mu\?\)-')
-  if [[ $python_version == "27m" ]]; then
+  if [[ $python_version == "27m" ]] || [[ $python_version == "34m" ]]; then
     continue
   elif [[ $python_version == "27mu" ]]; then
     image='python:2.7'
-  elif [[ $python_version == "34m" ]]; then
-    image='python:3.4'
   elif [[ $python_version == "35m" ]]; then
     image='python:3.5'
   elif [[ $python_version == "36m" ]]; then

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py34,py35,py36,py37
+envlist = py27,py35,py36,py37
 skipsdist = true
 
 [testenv]
@@ -12,7 +12,6 @@ deps =
   -r tests/requirements.txt
 basepython =
   py27: python2.7
-  py34: python3.4
   py35: python3.5
   py36: python3.6
   py37: python3.7
@@ -32,7 +31,6 @@ basepython = python
 ; [travis]
 ; python =
 ;   2.7: py27
-;   3.4: py34
 ;   3.5: py35
 ;   3.6: py36, docs
 ;   3.7: py37