Remove dev-requirements.txt

appveyor.yml

@@ -114,7 +114,7 @@ install:
   # compiled extensions and are not provided as pre-built wheel packages,
   # pip will build them from source using the MSVC compiler matching the
   # target Python version and architecture
-  - "%CMD_IN_ENV% pip install -r dev-requirements.txt"
+  - "%CMD_IN_ENV% pip install nose wheel"
 
 clone_script:
 - cmd: git clone -q --recursive --branch=%APPVEYOR_REPO_BRANCH% https://github.com/%APPVEYOR_REPO_NAME%.git %APPVEYOR_BUILD_FOLDER%

dev-requirements.txt

-nose
-wheel