A few updates, cleanup updated weather module.

triggers/link/link.sh

@@ -1,5 +1,14 @@
+#!/usr/bin/env bash
 [ -f functions.sh ] && source functions.sh
 
+# Dependencies required by this trigger
+dependencies=("curl" "w3m" "sed")
+
+# Silently skip if dependencies are missing (triggers shouldn't error in channel)
+if ! check_dependencies "${dependencies[@]}" &> /dev/null; then
+    exit 0
+fi
+
 for l in $3 ; do
 text="${l#:}"
 if [[ "${text}" =~ http://|https://|www\..* ]]; then