Add bashbrew/bashbrew.sh support any whitespace delimiter

in some case a tab looks better than space.

bashbrew/bashbrew.sh

@@ -212,15 +212,15 @@ for repoTag in "${repos[@]}"; do
 
 	tags=()
 	for line in "${repoTagLines[@]}"; do
-		tag="$(echo "$line" | awk -F ': +' '{ print $1 }')"
+		tag="$(echo "$line" | awk -F ':\\s+' '{ print $1 }')"
 		for parsedRepoTag in "${tags[@]}"; do
 			if [ "$repo:$tag" = "$parsedRepoTag" ]; then
 				echo >&2 "error: tag '$tag' is duplicated in '${cmd[@]}'"
 				exit 1
 			fi
 		done
 
-		repoDir="$(echo "$line" | awk -F ': +' '{ print $2 }')"
+		repoDir="$(echo "$line" | awk -F ':\\s+' '{ print $2 }')"
 
 		gitUrl="${repoDir%%@*}"
 		commitDir="${repoDir#*@}"