Updates Django 1.11 version in tox config

Django 1.11 officially released some time ago and a maintenance release
was even released soon after. The beta version reference is updated to
the standard semantic number scheme.

.travis.yml

@@ -8,29 +8,29 @@ env:
     - DJANGO="Django>=1.8.0,<1.9.0"   DB=postgresql DB_NAME=travis_ci_test
     - DJANGO="Django>=1.9.0,<1.10.0"  DB=postgresql DB_NAME=travis_ci_test
     - DJANGO="Django>=1.10.0,<1.11.0" DB=postgresql DB_NAME=travis_ci_test
-    - DJANGO="Django>=1.11b1,<2.0" DB=postgresql DB_NAME=travis_ci_test
+    - DJANGO="Django>=1.11.0,<2.0" DB=postgresql DB_NAME=travis_ci_test
 
     # SQLite3
     - DJANGO="Django>=1.8.0,<1.9.0"   DB=sqlite3 DB_NAME=db.sqlite3
     - DJANGO="Django>=1.9.0,<1.10.0"  DB=sqlite3 DB_NAME=db.sqlite3
     - DJANGO="Django>=1.10.0,<1.11.0" DB=sqlite3 DB_NAME=db.sqlite3
-    - DJANGO="Django>=1.11b1,<2.0" DB=sqlite3 DB_NAME=db.sqlite3
+    - DJANGO="Django>=1.11.0,<2.0" DB=sqlite3 DB_NAME=db.sqlite3
 
     # MySQL
     - DJANGO="Django>=1.8.0,<1.9.0"   DB=mysql DB_NAME=mysql_db
     - DJANGO="Django>=1.9.0,<1.10.0"  DB=mysql DB_NAME=mysql_db
     - DJANGO="Django>=1.10.0,<1.11.0" DB=mysql DB_NAME=mysql_db
-    - DJANGO="Django>=1.11b1,<2.0" DB=mysql DB_NAME=mysql_db
+    - DJANGO="Django>=1.11.0,<2.0" DB=mysql DB_NAME=mysql_db
 
 
 matrix:
   allow_failures:
     - python: "2.7"
-      env: DJANGO="Django>=1.11b1,<2.0"
+      env: DJANGO="Django>=1.11.0,<2.0"
     - python: "3.4"
-      env: DJANGO="Django>=1.11b1,<2.0"
+      env: DJANGO="Django>=1.11.0,<2.0"
     - python: "3.5"
-      env: DJANGO="Django>=1.11b1,<2.0"
+      env: DJANGO="Django>=1.11.0,<2.0"
 
 
   fast_finish: true