Disable pip cache then installing with make install

CHANGELOG.rst

@@ -21,6 +21,7 @@ Fixed
 * Allow both unicode and bytes dotted string in utils.import_attr
 * Fix some spelling and grammar on log messages. (thanks to Allie Micka)
 * Fix froms css class error on success/error due to a scpaless block
+* Disable pip cache then installing with make install
 
 Changed
 -------

Makefile

@@ -6,7 +6,7 @@ build:
 
 install: dist
 	pip -V
-	pip install --no-deps --upgrade --force-reinstall --find-links ./dist/django-cas-server-${VERSION}.tar.gz django-cas-server
+	pip install --no-cache-dir --no-deps --upgrade --force-reinstall --find-links ./dist/django-cas-server-${VERSION}.tar.gz django-cas-server
 
 uninstall:
 	pip uninstall django-cas-server || true