Makefile updated to use Python 3.9

Makefile

@@ -2,35 +2,35 @@ help:
 	cat Makefile
 
 test:
-	python3.8 -m pytest --benchmark-disable --showlocals
+	python3.9 -m pytest --benchmark-disable --showlocals
 
 verbose:
-	python3.8 -m pytest --benchmark-disable --showlocals --verbose
+	python3.9 -m pytest --benchmark-disable --showlocals --verbose
 
 xfails:
-	python3.8 -m pytest --benchmark-disable --verbose | egrep --color=always "xfail|XFAIL|xpass|XPASS"
+	python3.9 -m pytest --benchmark-disable --verbose | egrep --color=always "xfail|XFAIL|xpass|XPASS"
 
 cover:
-	python3.8 -m pytest --benchmark-disable --cov construct --cov-report html --cov-report term --verbose
+	python3.9 -m pytest --benchmark-disable --cov construct --cov-report html --cov-report term --verbose
 
 bench:
-	python3.8 -m pytest --benchmark-enable --benchmark-columns=min,stddev --benchmark-sort=name --benchmark-compare
+	python3.9 -m pytest --benchmark-enable --benchmark-columns=min,stddev --benchmark-sort=name --benchmark-compare
 
 benchsave:
-	python3.8 -m pytest --benchmark-enable --benchmark-columns=min,stddev --benchmark-sort=name --benchmark-compare --benchmark-autosave
+	python3.9 -m pytest --benchmark-enable --benchmark-columns=min,stddev --benchmark-sort=name --benchmark-compare --benchmark-autosave
 
 html:
 	cd docs; make html
 
 installdeps:
-	apt-get install python3.8 python3-sphinx --upgrade
-	python3.8 -m pip install pytest pytest-benchmark pytest-cov twine --upgrade
-	python3.8 -m pip install enum34 numpy arrow ruamel.yaml cloudpickle lz4 --upgrade
+	apt-get install python3.9 python3-pip python3-sphinx --upgrade
+	python3.9 -m pip install pytest pytest-benchmark pytest-cov twine --upgrade
+	python3.9 -m pip install enum34 numpy arrow ruamel.yaml cloudpickle lz4 --upgrade
 
 version:
 	./version-increment
 
 upload:
-	python3.8 ./setup.py sdist
-	python3.8 -m twine upload dist/*
+	python3.9 ./setup.py sdist
+	python3.9 -m twine upload dist/*