Minor syntax correction

utils.sh

@@ -6,7 +6,7 @@
  # and checking current user value, and prompts of yes/no user input.
  #
  # https://git.brandon-rodriguez.com/scripts/bash/utils
- # Version 1.3
+ # Version 1.3.1
  ##
 
 
@@ -520,7 +520,7 @@ function to_upper () {
     then
         # At least one arg passed. Loop through each one.
         return_value=()
-        for arg in $@
+        for arg in ${@}
         do
             return_value+=( $(echo "${arg}" | tr '[:lower:]' '[:upper:]') )
         done