Dropped Django 1.6.7 from Travis

Author: Brandon Taylor

.travis.yml

@@ -7,7 +7,6 @@ python:
     - "3.6"
 
 env:
-    - DJANGO_VERSION=1.6.7 SAMPLE_PROJECT=sample_project
     - DJANGO_VERSION=1.7.7 SAMPLE_PROJECT=sample_project
     - DJANGO_VERSION=1.8.7 SAMPLE_PROJECT=sample_project
     - DJANGO_VERSION=1.9 SAMPLE_PROJECT=sample_project
@@ -24,14 +23,6 @@ matrix:
             python: "2.7"
             env: DJANGO_VERSION=3.0.0 SAMPLE_PROJECT=sample_project
 
-        -
-            python: "3.4"
-            env: DJANGO_VERSION=1.6.7 SAMPLE_PROJECT=sample_project
-
-        -
-            python: "3.5"
-            env: DJANGO_VERSION=1.6.7 SAMPLE_PROJECT=sample_project
-
         -
             python: "3.5"
             env: DJANGO_VERSION=1.7.7 SAMPLE_PROJECT=sample_project