Merge pull request #20 from openedx/jawayria/fix-upgrade

fix: Install pip and pip-tools in upgrade script

Makefile

@@ -3,6 +3,8 @@ upgrade: ## update the requirements/*.txt files with the latest packages satisfy
 	pip install -q -r requirements/pip_tools.txt
 	pip-compile --upgrade --allow-unsafe -o requirements/pip.txt requirements/pip.in
 	pip-compile --upgrade -o requirements/pip_tools.txt requirements/pip_tools.in
+	pip install -qr requirements/pip.txt
+	pip install -qr requirements/pip_tools.txt
 	pip-compile --upgrade -o requirements/base.txt requirements/base.in
 	pip-compile --upgrade -o requirements/test.txt requirements/test.in
 	pip-compile --upgrade -o requirements/ci.txt requirements/ci.in