tox.ini: passenv: include TERM

Ref: tox-dev/tox#1441

Author: blueyed

tox.ini

@@ -44,7 +44,7 @@ setenv =
     coverage: COVERAGE_FILE={toxinidir}/.coverage
     coverage: PYTESTDJANGO_COVERAGE_SRC={toxinidir}/
 
-passenv = PYTEST_ADDOPTS
+passenv = PYTEST_ADDOPTS TERM
 usedevelop = True
 commands =
     coverage: coverage erase