Update run_tests.yml

Author: samueldmcdermott

.github/workflows/run_tests.yml

@@ -20,10 +20,10 @@ jobs:
         echo $CONDA/bin >> $GITHUB_PATH
     - name: Install dependencies
       run: |
-        conda env update --file environment.yml --name base
+        conda env update --file=environment.yml --name=base
         python -m pip install colossus pixell camb
         python -m pip install .
     - name: Test with pytest
       run: |
         conda install pytest
-        pytest
+        pytest