Update unittest.yml

Author: Juntongkuki

.github/workflows/unittest.yml

@@ -20,9 +20,6 @@ jobs:
           git clone https://github.com/Juntongkuki/tnlearn_actions
           cd tnlearn_actions/tests
 
-      - name: install tnlearn
-        run: pip install tnlearn
-
       - name: run test_base
         run: python test_base.py