Merge pull request release-engineering#288 from rohanpm/fix-tox4

Fix compatibility with tox 4

tox.ini

@@ -6,7 +6,7 @@ deps=
     -rtest-requirements.txt
 commands=
 	pytest -vv  {posargs:./}
-whitelist_externals=sh
+allowlist_externals=sh
 
 [testenv:py27]
 deps=
@@ -29,13 +29,6 @@ usedevelop=true
 commands=
 	pytest --cov-report=html --cov-report=xml --cov=src --cov-fail-under=100 {posargs}
 
-[testenv:cov-travis]
-passenv = TRAVIS TRAVIS_*
-usedevelop=true
-commands=
-	pytest --cov=src {posargs}
-	coveralls
-
 [testenv:docs]
 use_develop=true
 commands=