Run on a bunch more versions

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index d807342..4e4704c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,18 +10,28 @@
 
 jobs:
   include:
-  - name: "run test suite with python 3.4"
-    python: 3.4
+  - python: 2.7
+  - python: 3.4
     dist: trusty
-  - name: "run test suite with python 3.5"
-    python: 3.5.1
+  - python: 3.5.0
     dist: trusty
-  - name: "run test suite with python 3.6"
-    python: 3.6
-  - name: "run test suite with python 3.7"
-    python: 3.7
-  - name: "run test suite with python 3.8-dev"
-    python: 3.8-dev
+  - python: 3.5.1
+    dist: trusty
+  - python: 3.5.2
+    dist: trusty
+  - python: 3.5.3
+    dist: trusty
+  - python: 3.5
+    dist: trusty
+  - python: 3.6.0
+  - python: 3.6.1
+  - python: 3.6.2
+  - python: 3.6
+  - python: 3.7.0
+  - python: 3.7.1
+  - python: 3.7
+  - python: 3.8-dev
+
   - name: "check code style with flake8"
     python: 3.7
     env: