drop django below 1.11

Author: auvipy

tox.ini

@@ -1,9 +1,9 @@
 [tox]
 envlist =
-    py27-django{18,19,110,111}
-    py34-django{18,19,110,111,20}
-    py35-django{18,19,110,111,20}
-    pypy-django{18,19,110,111}
+    py27-django{111}
+    py34-django{111,20}
+    py35-django{111,20}
+    pypy-django{111}
 
     flake8
     flakeplus
@@ -14,9 +14,6 @@ envlist =
 
 [travis:env]
 DJANGO =
-    1.8: django18
-    1.9: django19
-    1.10: django110
     1.11: django111
     2.0: django20
 
@@ -30,9 +27,6 @@ deps=
 
     django20: -r{toxinidir}/requirements/test-django20.txt
     django111: -r{toxinidir}/requirements/test-django111.txt
-    django110: -r{toxinidir}/requirements/test-django110.txt
-    django19: -r{toxinidir}/requirements/test-django19.txt
-    django18: -r{toxinidir}/requirements/test-django18.txt
 
     py{27,34,35,py},cov: ephem