Add pytest-django and pytest-cov to requirements

.gitlab-ci.yml

@@ -62,7 +62,6 @@ before_script:
     - if [[ "${PYTHON_MAJOR}" -eq 2 ]]; then apt-get -o dir::cache::archives="${APT_CACHE_DIR}" install -yqq python-voeventlib; fi
     # install everything else from pip
     - ${PYTHON} -m pip install -r requirements.txt
-    - ${PYTHON} -m pip install pytest-django pytest-cov
     # install lalsuite for glue.ligolw
     - ${PYTHON} -m pip install lalsuite
     # create logs path required for tests

requirements.txt

@@ -32,9 +32,11 @@ service_identity==17.0.0
 simplejson==3.15.0
 Sphinx==1.7.0
 twilio==6.10.3
+pytest-cov==2.6.1
+pytest-django==3.4.8
+pytz==2018.9
 # Fixed at old versions to prevent bugs:
 # https://github.com/fritzy/SleekXMPP/issues/477
 # https://github.com/etingof/pyasn1/issues/112
 pyasn1==0.3.6
 pyasn1-modules==0.1.5
-pytz==2018.9