📖 Document version and help options in cli help

bemoji

@@ -33,6 +33,8 @@ usage() {
     echo "   -e             Only echo out the picked emoji."
     echo "   -D <choice>    Choose specific default lists to download if none found locally."
     echo "                  Valid choices: all|none|emoji|math."
+    echo "   -v             Display current program version."
+    echo "   -h             Show this help."
     echo
     exit "$1"
 }