bugsnag/bugsnag-js v6.4.1 on GitHub

(plugin-koa): Ensure unhandled Koa errors are logged out and that non-errors don't generate two reports #614
(plugin-inline-script-content): Tolerate errors when trying to call existing installed handler #613 (fixes #608)
(plugin-inline-script-content): Ensure line numbers are correct when error is at line 1/2/3 #616
(plugin-koa|express|restify): Ensure clientIp and referer are properly collected #617 (fixes #615)