Report coverage information to the terminal (#165)

Also, upgrade the relevant package dependencies to their latest
versions.

dev-requirements.txt

@@ -1,7 +1,7 @@
-coverage==4.5.1
+coverage==6.3.3
 fakeredis==0.7.0
 flake8==4.0.1
 freezegun==0.3.15
-pytest-cov==2.5.1
 pytest==7.1.2
+pytest-cov==3.0.0
 tox==3.1.2

tox.ini

@@ -7,7 +7,7 @@ setenv =
 commands =
     pip install -r requirements.txt
     pip install -r dev-requirements.txt
-    pytest --junitxml=junit-{envname}.xml --cov-report xml tests.py
+    pytest --cov=snappass --cov-report=term-missing tests.py
 
 [testenv:flake8]
 commands =