Update test-python.yml (actions#246)

Author: konradpabjan

.github/workflows/test-python.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-latest, windows-latest, ubuntu-16.04, ubuntu-18.04, ubuntu-20.04]
+        os: [macos-latest, windows-latest, ubuntu-18.04, ubuntu-20.04]
     steps:
     - name: Checkout
       uses: actions/checkout@v2
@@ -38,7 +38,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-latest, windows-latest, ubuntu-16.04, ubuntu-18.04, ubuntu-20.04]
+        os: [macos-latest, windows-latest, ubuntu-18.04, ubuntu-20.04]
         python: [3.5.4, 3.6.7, 3.7.5, 3.8.1]
     steps:
     - name: Checkout
@@ -68,7 +68,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-latest, windows-latest, ubuntu-16.04, ubuntu-18.04, ubuntu-20.04]
+        os: [macos-latest, windows-latest, ubuntu-18.04, ubuntu-20.04]
     steps:
     - name: Checkout
       uses: actions/checkout@v2
@@ -97,7 +97,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-latest, windows-latest, ubuntu-16.04, ubuntu-18.04, ubuntu-20.04]
+        os: [macos-latest, windows-latest, ubuntu-18.04, ubuntu-20.04]
     steps:
     - name: Checkout
       uses: actions/checkout@v2