more constrains

.travis.yml

@@ -7,7 +7,9 @@ cache:
 matrix:
     include:
         - python: "2.7"
-          env: TOXENV=flake8,isort
+          env: TOXENV=lint-py2
+        - python: "3.6"
+          env: TOXENV=lint-py3
         - python: "2.7"
           env: TOXENV=py27
         - python: "3.4"
@@ -18,7 +20,7 @@ matrix:
           env: TOXENV=py36
 
 install:
-    - travis_retry pip install -U tox coveralls coverage
+    - travis_retry pip install -U -c constrains.txt tox coveralls coverage
 
 script:
     - travis_retry tox

constrains.txt

@@ -1,8 +1,12 @@
+alabaster==0.7.10
+Babel==2.5.0
+certifi==2017.7.27.1
+chardet==3.0.4
 configparser==3.5.0
 cssselect==1.0.1
+docutils==0.14
 enum-compat==0.0.2
 enum34==1.1.6
-flake8==3.4.1
 flake8-blind-except==0.1.1
 flake8-coding==1.3.0
 flake8-commas==0.4.3
@@ -11,14 +15,18 @@ flake8-deprecated==1.2.1
 flake8-html==0.4.0
 flake8-isort==2.2.1
 flake8-pep3101==1.1
+flake8-plone-hasattr==0.2.post0
 flake8-polyfill==1.0.1
 flake8-print==2.0.2
 flake8-quotes==0.11.0
 flake8-strict==0.1.4
 flake8-string-format==0.2.3
 flake8-todo==0.7
+flake8==3.4.1
 FormEncode==1.3.1
 future==0.16.0
+idna==2.6
+imagesize==0.7.1
 isort==4.2.15
 Jinja2==2.9.6
 lxml==3.8.0
@@ -27,7 +35,14 @@ mccabe==0.6.1
 pycodestyle==2.3.1
 pyflakes==1.5.0
 Pygments==2.2.0
+pytz==2017.2
 repoze.xmliter==0.6
+requests==2.18.4
 six==1.10.0
+snowballstemmer==1.2.1
+Sphinx==1.6.3
+sphinxcontrib-websupport==1.0.1
 testfixtures==5.1.1
+typing==3.6.2
+urllib3==1.22
 WebOb==1.7.3