Change git difftool to prompt, actually install .gitconfig

.gitconfig

@@ -4,6 +4,6 @@
 [diff]
 	tool = vimdiff
 [difftool]
-	prompt = false
+	prompt = true
 [push]
 	default = simple

install.sh

@@ -4,3 +4,4 @@ git submodule sync;
 git submodule update;
 
 rsync --exclude ".git/" --exclude ".git*" --exclude "install.sh" --exclude "py3status" -avhE  --no-perms . ~;
+cp ./.gitconfig ~/.gitconfig;