travis: stop testing on py34 on macOS due to OpenSSL 1.1 incompatibility

.travis.yml

@@ -27,10 +27,6 @@ matrix:
           os: linux
           dist: xenial
           env: TOXENV=py37
-        - language: generic
-          os: osx
-          osx_image: xcode8.3
-          env: TOXENV=py34
         - language: generic
           os: osx
           osx_image: xcode8.3

.travis/install.sh

@@ -27,10 +27,6 @@ if [[ "$(uname -s)" == 'Darwin' ]]; then
     fi
 
     case "${TOXENV}" in
-        py34)
-            pyenv install 3.4.5
-            pyenv global 3.4.5
-            ;;
         py35)
             pyenv install 3.5.3  # minimum for openssl 1.1.x
             pyenv global 3.5.3