A few updates, cleanup updated weather module.

modules/sing/sing.sh

@@ -1,8 +1,18 @@
+#!/usr/bin/env bash
 [ -f functions.sh ] && source functions.sh
 
+# Dependencies required by this module
+dependencies=("clyrics")
+
 shift
 chan="$1"
 shift
+
+# Check dependencies before running
+if ! check_dependencies "${dependencies[@]}"; then
+    msg "$chan" "$1: This module requires: ${dependencies[*]}"
+    exit 1
+fi
 #get the lyric text into a variable
 lyricText="$(clyrics $@ | tr '[:space:]' ' ' | tr -s ' ' | fold -s -w 384)"
 i=$(echo "$lyricText" | wc -l)