Update wercker.yml

Author: yxd-hde

wercker.yml

@@ -7,10 +7,6 @@ build:
         code: |
           pip install virtualenv
 
-    - virtualenv:
-        name: setup virtual environment
-        install_wheel: true # Enable wheel to speed up builds (experimental)
-
     - script:
         name: echo python information
         code: |
@@ -20,6 +16,10 @@ build:
     - script:
         name: build
         code: |
+          export VIRTUALENV_LOCATION=$HOME/venv
+          virtualenv --no-site-packages -p $(which python) $VIRTUALENV_LOCATION
+          source "$VIRTUALENV_LOCATION/bin/activate"
+          
           python setup.py sdist bdist_wheel
 
 deploy: