update gitconfig example

src/GIT-config.md

@@ -36,6 +36,7 @@ git config --global fetch.prune true            # Автоматическая
 [user]
 	name = ARNik
 	email = arnik@arnik.ru
+	signingkey = AEBB0598F42201E3
 [color]
 	ui = true
 [core]
@@ -47,9 +48,19 @@ git config --global fetch.prune true            # Автоматическая
 	co = checkout
 	br = branch
 	ct = commit
+	sign = commit --amend --no-edit -S
+	unsign = commit --amend --no-edit
+	signoff = commit --amend --no-edit -s
+	pr = remote prune origin
 
 	lg = log --graph --all\
-	--pretty=format:'%Cred%h%Creset -%C(auto)%d %Creset%s %Cgreen(%cr) %C(bold blue)<%an>%Creset'
+	--pretty=format:'%Cred%h%Creset -%C(auto)%d %Creset%s %Cgreen(%cr) %C(bold blue)<%an>%Creset %G?'
+
+# to pevent "fatal: detected dubious ownership in repository"
+[safe]
+	directory = *
+[gpg "ssh"]
+	allowedSignersFile = ~/.ssh/allowed_signers
 ```
 ---
 Для изучения Git и в качестве справки хочу порекомендовать: