travis: use build names (#378)

.travis.yml

@@ -10,6 +10,7 @@ python:
   - "3.6"
   - "3.5"
   - "2.7"
+  - "3.8-dev"
 
 cache: pip
 
@@ -39,6 +40,7 @@ after_success:
 matrix:
   include:
     - &django_py27
+      name: "Django test (Python 2.7)
       python: "2.7"
       install:
         - pip install -U pip
@@ -59,6 +61,7 @@ matrix:
 
     - &django_py3
       <<: *django_py27
+      name: "Django test (Python 3.7)"
       python: "3.7"
 
 # vim: sw=2 ts=2 sts=2