pip freeze to log environment

Author: alimanfoo

.travis.yml

@@ -23,6 +23,7 @@ matrix:
 install:
   - pip install -U tox-travis coveralls pip setuptools wheel
   - python setup.py build_ext --inplace
+  - pip freeze
 
 script:
   - tox

appveyor.yml

@@ -40,14 +40,15 @@ environment:
 install:
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
   - git submodule update --init --recursive
-
-build: off
-
-test_script:
   - "%CMD_IN_ENV% python -m pip install -U pip setuptools wheel"
   - "%CMD_IN_ENV% python -m pip install -rrequirements_dev.txt"
   - "%CMD_IN_ENV% python -m pip install -rrequirements_test.txt"
   - "%CMD_IN_ENV% python setup.py build_ext --inplace"
+  - "%CMD_IN_ENV% python -m pip freeze"
+
+build: off
+
+test_script:
   - "%CMD_IN_ENV% python -m pytest -v numcodecs"
 
 after_test: