  [tox]
  envlist =
         {py27,py34,py35,py36}-django111,
         {py34,py35,py36}-django20,
         {py35,py36}-django21
         {py35,py36}-djangomaster,
         base,dist,lint,docs,
  
  [travis:env]
  DJANGO =
      1.11: django111
 
</s> remove       - env: DJANGO=2.1
 </s> add 
       {py34,py35,py36,py37}-django20,
       {py35,py36,py37}-django21
       {py35,py36,py37}-djangomaster,
  [tox]
  envlist =
         {py27,py34,py35,py36}-django111,
       {py34,py35,py36,py37}-django20,
       {py35,py36,py37}-django21
       {py35,py36,py37}-djangomaster,
       {py34,py35,py36,py37}-django20,
       {py35,py36,py37}-django21
       {py35,py36,py37}-djangomaster,
       {py34,py35,py36,py37}-django20,
       {py35,py36,py37}-django21
       {py35,py36,py37}-djangomaster,
         base,dist,lint,docs,
  
  [travis:env]
  DJANGO =
      1.11: django111
keep keep keep replace replace replace keep keep keep keep keep
 Add Python 3.7 support (#6141) 
tox.ini