renaming

diff --git a/sfa/methods/DeleteSliver.py b/sfa/methods/Delete.py
similarity index 100%
rename from sfa/methods/DeleteSliver.py
rename to sfa/methods/Delete.py

diff --git a/sfa/methods/RenewSliver.py b/sfa/methods/Renew.py
similarity index 100%
rename from sfa/methods/RenewSliver.py
rename to sfa/methods/Renew.py