fix appveyor

Author: alimanfoo

appveyor.yml

@@ -41,10 +41,8 @@ install:
 build: off
 
 test_script:
-  - "%CMD_IN_ENV% python -m pip install -U pip"
-  - "%CMD_IN_ENV% python -m pip install -U setuptools wheel"
-  - "%CMD_IN_ENV% python -m pip install -rrequirements_test.txt"
-  - "%CMD_IN_ENV% python -m pip install -rrequirements.txt"
+  - "%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 setup.py build_ext --inplace"
   - "%CMD_IN_ENV% python -m nose -v"