modify aliases

.gitconfig

@@ -1,6 +1,6 @@
 [alias]
   # View abbreviated SHA, description, and history graph of the latest 20 commits
-  l = log --pretty=oneline -n 20 --graph --abbrev-commit
+  l = log --oneline -n 20 --graph --show-signature
   # View the current working tree status using the short format
   s = status -s
   # Show the diff between the latest commit and the current state
@@ -12,7 +12,7 @@
   # Clone a repository including all submodules
   c = clone --recursive
   # Commit all changes
-  ca = !git add -A && git commit -av
+  ca = !git add -A && git commit -av -S
   # Switch to a branch, creating it if necessary
   go = checkout -B
   # Show verbose output about tags, branches or remotes