Update tox.ini

Author: barseghyanartur

tox.ini

@@ -2,7 +2,7 @@
 envlist =
     py{27,35,36}-{django111}
     py{35,36}-{django20}
-    py{36,37}-{django111,django20,django21,django22}-{none,coreapischema}
+    py{36,37}-{django111,django20,django21,django22,django30}-{none,coreapischema}
 
 [testenv]
 envlogdir=
@@ -15,6 +15,7 @@ deps =
     django20: -r{toxinidir}/examples/requirements/django_2_0.txt
     django21: -r{toxinidir}/examples/requirements/django_2_1.txt
     django22: -r{toxinidir}/examples/requirements/django_2_2.txt
+    django30: -r{toxinidir}/examples/requirements/django_3_0.txt
     coreapischema: -r{toxinidir}/examples/requirements/coreapi_coreschema.txt
     none: -r{toxinidir}/examples/requirements/none.txt
 commands =