[EN-1642] pytest instead of task

Author: iamishalkin

.github/workflows/testpackage.yml

@@ -48,7 +48,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.7, 3.8]
 
     runs-on: ${{ matrix.os }}
 
@@ -71,7 +71,7 @@ jobs:
       shell: bash
     - name: Run tests
       run: |
-        task test
+        pytest tests
       shell: bash
     - name: Generate doc
       run: |