typo.

# Previous commits:
#   07ec6f7 Update german translation.
#   979dc93 Re-order --help messages.
#   961deff Add --status and --status-interval.
#   1cf6306 Add linter-exception for EXIT_FATAL.

src/options.cpp

@@ -107,7 +107,7 @@ options parse_options(int argc, char *argv[])
         ("html",
          translate("Output HTML instead of plain text.").str().data())
         ("status",
-         translate("Output status message every STATUS-INTERVAL seconds")
+         translate("Output status message every STATUS-INTERVAL seconds.")
          .str().data())
         ("status-interval", po::value<std::uint64_t>()
          ->value_name(translate("NUMBER"))->default_value(30),