Support Python 3.10 and Drop Python 3.5 (#487)

* linux: Use manylinux2014
* mac: Drop Python 3.6 too

docker/buildwheel.sh

@@ -7,10 +7,12 @@ set -e -x
 ARCH=`uname -p`
 echo "arch=$ARCH"
 
+ls /opt/python
+
 for V in "${PYTHON_VERSIONS[@]}"; do
     PYBIN=/opt/python/$V/bin
     rm -rf build/       # Avoid lib build by narrow Python is used by wide python
-    $PYBIN/python setup.py bdist_wheel
+    $PYBIN/python -m build -w
 done
 
 cd dist

docker/shared.env

@@ -1,7 +1,7 @@
 PYTHON_VERSIONS=(
+    cp310-cp310
     cp39-cp39
     cp38-cp38
     cp37-cp37m
     cp36-cp36m
-    cp35-cp35m
 )