Use correct pip installation command

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

azure-pipelines.yml

@@ -74,20 +74,20 @@ jobs:
           image_name: ubuntu-20.04
           python_versions: ['3.6', '3.7', '3.8', '3.9']
           test_suites:
-              all: tmp/bin/pip --force-reinstall --upgrade -e . && tmp/bin/pytest -n 2 -vvs
+              all: tmp/bin/pip install --force-reinstall --upgrade -e . && tmp/bin/pytest -n 2 -vvs
 
     - template: etc/ci/azure-win.yml
       parameters:
           job_name: win2019_cpython_latest_from_pip
           image_name: windows-2019
           python_versions: ['3.6', '3.7', '3.8', '3.9']
           test_suites:
-              all: tmp\Scripts\pip --force-reinstall --upgrade -e . &&  tmp\Scripts\pytest -n 2 -vvs
+              all: tmp\Scripts\pip install --force-reinstall --upgrade -e . &&  tmp\Scripts\pytest -n 2 -vvs
 
     - template: etc/ci/azure-posix.yml
       parameters:
           job_name: macos1015_cpython_latest_from_pip
           image_name: macos-10.15
           python_versions: ['3.6', '3.7', '3.8', '3.9']
           test_suites:
-              all: tmp/bin/pip --force-reinstall --upgrade -e . && tmp/bin/pytest -n 2 -vvs
+              all: tmp/bin/pip install --force-reinstall --upgrade -e . && tmp/bin/pytest -n 2 -vvs