CI(appveyor.yml): Clear `pip` cache with `remove-old-files.py`

diff --git a/project_template/appveyor.yml b/project_template/appveyor.yml
index 5f9b60e16f2adba825567cf19d9289eebe5f4ed0..5a675a66b7e3d4e322f5f1821d173612cc826ed8 100644 (file)
--- a/project_template/appveyor.yml
+++ b/project_template/appveyor.yml
@@ -87,6 +87,7 @@ test_script:
 #      %CMD_IN_ENV% python setup.py bdist_wheel &&
 #      ls dist
 #    )
+#  - remove-old-files.py -o 180 %LOCALAPPDATA%\\pip\\Cache
 #
 #artifacts:
 #  # Archive the generated packages in the ci.appveyor.com build report