tox.ini: Default to fail coverage under 95%

Allow 65% coverage only on Python 3.4 where lxml is not
being installed.

Related to #16

.cirrus.yml

@@ -21,6 +21,7 @@ Linux_task:
   script:
     - python --version
     - PY=$(python3 -c 'import sys; print("%d%d" % (sys.version_info[0], sys.version_info[1]))')
+    - if [[ $PY == 34 ]]; then export COV_FAIL_UNDER=65; fi
     - python -m tox -e py$PY
     - bash <(curl -s https://codecov.io/bash)
 

tox.ini

@@ -4,6 +4,8 @@ skip_missing_interpreters = true
 
 [testenv]
 usedevelop = true
+passenv =
+  COV_FAIL_UNDER
 deps = 
   py34: colorama!=0.4.2
   .
@@ -16,4 +18,4 @@ deps =
   tldextract
   regex
 commands =
-  pytest --cov=https_everywhere --maxfail=5 -rs
+  pytest --cov=https_everywhere --cov-fail-under={COV_FAIL_UNDER:95} --maxfail=5 -rs