Travis,AppVeyour: Pin Tox version to fix the build

It seems that Tox 3.5.0 breaks the `--installpkg` option, so pin Tox version to 3.4.0 to fix the tests and to avoid such surprises caused by a new relesease for Tox in the future. See the relavant Tox issue and the failing Travis build log: tox-dev/tox#1042 https://travis-ci.org/suutari/prequ/jobs/438550460
suutari · Oct 8, 2018 · 1c022d2 · 1c022d2
1 parent 3a8c9f6
commit 1c022d2
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diff --git a/.appveyor.yml b/.appveyor.yml
@@ -18,7 +18,7 @@ environment:
 install:
   - python -m pip install -U pip setuptools wheel
   - pip install codecov
-  - pip install -U tox
+  - pip install tox==3.4.0
 build_script:
   - python setup.py bdist_wheel
 test_script:

diff --git a/.travis.yml b/.travis.yml
@@ -39,7 +39,7 @@ matrix:
       python: "2.7"
 
 install:
-  - pip install tox-travis
+  - pip install tox==3.4.0 tox-travis
   - pip install codecov
   - pip install -U pip setuptools
   - python setup.py bdist_wheel