use sane travis config add newer pytest versions and remove tox-travis

.travis.yml

@@ -6,13 +6,17 @@ python:
 - '3.4'
 - '3.5'
 - '3.6'
-install: pip install tox-travis setuptools_scm
+env:
+- TOXENV=py-pytest30
+- TOXENV=py-pytest31
+- TOXENV=py-pytest32
+install: pip install tox setuptools_scm
 matrix:
   include:
   # note: please use "tox --listenvs" to populate the build matrix
-  - python: "3.5"
+  - python: "3.6"
     env: TOXENV=flakes
-  - python: "3.5"
+  - python: "3.6"
     env: TOXENV=readme
 
 script: tox

tox.ini

@@ -1,8 +1,8 @@
 [tox]
 # if you change the envlist, please update .travis.yml file as well
 envlist=
-  py{26,27,34,35,36}-pytest{30}
-  py{27,35}-pytest{30}-pexpect
+  py{26,27,34,35,36}-pytest{30,31,32}
+  py{27,36}-pytest{30,31,32}-pexpect
   flakes
   readme
 
@@ -15,6 +15,8 @@ deps =
   # to avoid .eggs
   setuptools_scm
   pytest30: pytest~=3.0.5
+  pytest31: pytest~=3.1.0
+  pytest32: pytest~=3.2.0
   pexpect: pexpect
 platform=
   pexpect: linux|darwin