Remove ubuntu16.04 test

Signed-off-by: Chin Yeung Li <[email protected]>

Author: chinyeungli

azure-pipelines.yml

@@ -7,14 +7,6 @@
 
 jobs:
 
-    - template: etc/ci/azure-posix.yml
-      parameters:
-          job_name: ubuntu16_cpython
-          image_name: ubuntu-16.04
-          python_versions: ['3.6', '3.7', '3.8', '3.9']
-          test_suites:
-              all: venv/bin/pytest -vvs
-
     - template: etc/ci/azure-posix.yml
       parameters:
           job_name: ubuntu18_cpython