drop python 2.7 and 3.5, add python 3.9

Dockerfile.wheels

@@ -177,11 +177,16 @@ RUN mkdir -p /src \
     && make install
 
 # Bake dev requirements into the Docker image for faster builds
+# XXX setuptools 57.5.0 installed to avoid https://github.com/nextgis/pygdal/issues/67
+# we need to update setup.py instead
 ADD requirements.txt /tmp/requirements.txt
 RUN for PYBIN in /opt/python/*/bin; do \
         if [[ $PYBIN == *"26"* ]]; then continue; fi; \
+        if [[ $PYBIN == *"27"* ]]; then continue; fi; \
         if [[ $PYBIN == *"33"* ]]; then continue; fi; \
+        if [[ $PYBIN == *"35"* ]]; then continue; fi; \
         $PYBIN/pip install -U pip ; \
+        $PYBIN/pip install --upgrade --no-cache-dir setuptools==57.5.0 ; \
         $PYBIN/pip install -r /tmp/requirements.txt ; \
     done
 

build-linux-wheels.sh

@@ -12,7 +12,9 @@ source /opt/rh/devtoolset-2/enable
 pushd ${GDAL_BUILD_PATH}
 for PYBIN in /opt/python/*/bin; do
     if [[ $PYBIN == *"26"* ]]; then continue; fi
+    if [[ $PYBIN == *"27"* ]]; then continue; fi
     if [[ $PYBIN == *"33"* ]]; then continue; fi
+    if [[ $PYBIN == *"35"* ]]; then continue; fi
     export PATH=${PYBIN}:$ORIGINAL_PATH
     rm -rf build
     CFLAGS="-std=c++11" python setup.py bdist_wheel -d ${UNREPAIRED_WHEELS}

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 skipsdist = True
-envlist= py27,py35,py36,py37,py38,py39
+envlist= py36,py37,py38,py39
 
 [testenv]
 deps = pytest