Fix .travis.yml and tox.ini

Signed-off-by: Stanislav Filin <[email protected]>

Author: stasfilin

.travis.yml

@@ -9,7 +9,7 @@ env:
 - PACKAGES="django>=1.8,<1.9"
 - PACKAGES="django>=1.10,<1.11"
 - PACKAGES="django>=1.11,<1.12"
-- PACKAGES="django==2.0"
+- PACKAGES="django>=2.0,<2.1"
 before_install:
 - pip install codecov
 install:

tox.ini

@@ -2,9 +2,8 @@
 envlist=
     py27-django{18,110,111},
     py34-django{18,110,111},
-    py35-django{18,110,111},
-    py36-django{111},
-    py36-django{20},
+    py35-django{18,110,111,20},
+    py36-django{111,20},
 ;    docs,
 
 [testenv]
@@ -14,7 +13,7 @@ deps =
     django18: Django >= 1.8, < 1.9
     django110: Django >= 1.10, < 1.11
     django111: Django >= 1.11, < 1.12
-    django20: Django == 2.0
+    django20:  Django >= 2.0,  <2.1
     py26: mock
     py27: mock
 ;    django-dev: https://github.com/django/django/tarball/master