Update etcd version, add py36

Also remove the upper constraints

.travis.yml

@@ -1,23 +1,40 @@
-# ref: https://docs.travis-ci.com/user/languages/python
-language: python
-sudo: true
+dist: trusty
+sudo: required
 services:
   - docker
-env:
-  - TOXENV=pep8
-  - TOXENV=pypy
-  - TOXENV=pypy-etcd
-  - TOXENV=py27
-  - TOXENV=py27-etcd
-  - TOXENV=py27-codecov
-  - TOXENV=py35
-  - TOXENV=py35-etcd
-  - TOXENV=docs
-  - TOXENV=examples
-  - TOXENV=releasenotes
-
+language: python
+matrix:
+  include:
+    - python: 2.7
+      env: TOXENV=pep8
+    - python: 2.7
+      env: TOXENV=py27
+    - python: 2.7
+      env: TOXENV=py27-etcd
+    - python: 2.7
+      env: TOXENV=py27-codecov
+    - python: pypy
+      env: TOXENV=pypy
+    - python: pypy
+      env: TOXENV=pypy-etcd
+    - python: 3.5
+      env: TOXENV=py35
+    - python: 3.5
+      env: TOXENV=py35-etcd
+    - python: 3.6
+      env: TOXENV=py36
+    - python: 3.6
+      env: TOXENV=py36-etcd
+before_install:
+  - python --version
+  - uname -a
+  - lsb_release -a
 install:
-  - pip install tox
-
+  - python -m pip install pip -U
+  - python -m pip install tox coverage coveralls
+  - python -m virtualenv --version
+  - python -m easy_install --version
+  - python -m pip --version
+  - python -m tox --version
 script:
   - tox

setup-etcd-env.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eux
 if [ -z "$(which etcd)" ]; then
-    ETCD_VERSION=3.1.4
+    ETCD_VERSION=3.1.10
     case `uname -s` in
         Darwin)
             OS=darwin

tox.ini

@@ -1,12 +1,11 @@
 [tox]
 minversion = 2.0
-envlist = py35,py27,pypy,pep8
+envlist = py36,py35,py27,pypy,pep8
 skipsdist = True
 
 [testenv]
 passenv = TOXENV CI TRAVIS TRAVIS_*
 usedevelop = True
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
    PYTHONWARNINGS=default::DeprecationWarning
@@ -43,6 +42,9 @@ commands = {toxinidir}/setup-etcd-env.sh pifpaf -g TOOZ_TEST run etcd -- python
 [testenv:py35-etcd]
 commands = {toxinidir}/setup-etcd-env.sh pifpaf -g TOOZ_TEST run etcd -- python setup.py test --slowest --testr-args='{posargs}'
 
+[testenv:py36-etcd]
+commands = {toxinidir}/setup-etcd-env.sh pifpaf -g TOOZ_TEST run etcd -- python setup.py test --slowest --testr-args='{posargs}'
+
 [testenv:examples]
 commands = {toxinidir}/setup-etcd-env.sh pifpaf -g TOOZ_TEST run etcd -- python {toxinidir}/etcd3gw/examples/etcd.py