Added the entry for skip-tests in the environment.yml (#1113)

Author: rohitnig

.circleci/unittest/linux_libs/scripts_habitat/environment.yml

@@ -11,6 +11,7 @@ dependencies:
     - pytest-cov
     - pytest-mock
     - pytest-instafail
+    - pytest-error-for-skips
     - pytest-rerunfailures
     - expecttest
     - pyyaml