Separated update from run script.

run.sh

@@ -1,7 +1,5 @@
 #!/bin/sh
 
-git checkout master
-git reset --hard
-git pull origin master --ff-only
+./update.sh
 
 java -XX:+UseG1GC -Xmx5G -jar paper.jar nogui

update.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+git reset --hard
+git pull origin master --ff-only
+git checkout master@{'24 hours ago'}