Merge pull request kivy#6375 from matham/master

Fix CI failure, 3.5.7 doesn't have compiled binaries.

.travis.yml

@@ -42,7 +42,7 @@ matrix:
         - docker
     - language: generic
       os: osx
-      env: PYVERS="3.5.7 3.6.8 3.7.3" PY=3 RUN=wheels USE_PANGOFT2=0
+      env: PYVERS="3.5.4 3.6.8 3.7.3" PY=3 RUN=wheels USE_PANGOFT2=0
       name: "OSX - wheel generation"
     - language: generic
       env: PY=3 RUN=app USE_PANGOFT2=0
@@ -110,8 +110,8 @@ install:
       fi;
       if [ "${RUN}" == "unit" ]; then
          export PATH=$PATH:$HOME/Library/Python/3.5/bin;
-         curl -O -L https://www.python.org/ftp/python/3.5.2/python-3.5.2-macosx10.6.pkg;
-         sudo installer -package python-3.5.2-macosx10.6.pkg -target /;
+         curl -O -L https://www.python.org/ftp/python/3.5.4/python-3.5.4-macosx10.6.pkg;
+         sudo installer -package python-3.5.4-macosx10.6.pkg -target /;
          python3 get-pip.py --user;
          python3 -m pip install --upgrade --user cython pillow pytest mock docutils PyInstaller;
       fi;