Fix installer

script-install-reverse-proxy

@@ -2,7 +2,10 @@
 # Adds a reverse proxy for local system services
 # Copyright 2021 Bryan C. Roessler
 
-[[ -f functions ]] && . functions || exit 1
+parent="${BASH_SOURCE[0]}"
+parent=${parent%/*}
+
+[[ -f "$parent"/functions ]] && . "$parent"/functions || exit 1
 
 is_root