Don't use exec in update hook

Author: dmsck

hooks/update

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 
 [[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # Load RVM into a shell session *as a function*
-exec $(dirname $(readlink -f $0))/update.rb "$@"
+$(dirname $(readlink -f $0))/update.rb "$@"