update hubot-matteruser to ^5.3.0

[joemcl]

updating hubot-matteruser in package.json to ^5.3.0 should allow using access tokens for Bolts to log in , and fix #25 . I tried this in #33 but got errors about dependencies needed -

2019-12-05T23:31:12.073896+00:00 app[web.1]: npm WARN hubot-help@0.2.2 requires a peer of coffee-script@^1.12.6 but none is installed. You must install peer dependencies yourself.
2019-12-05T23:31:12.074265+00:00 app[web.1]: npm WARN hubot-matteruser@5.3.1 requires a peer of hubot@>=3.0.1 but none is installed. You must install peer dependencies yourself.
2019-12-05T23:31:12.074457+00:00 app[web.1]: npm WARN jsdom@15.2.0 requires a peer of canvas@^2.5.0 but none is installed. You must install peer dependencies yourself.

[xurizaemon]

@MikeyMJCO does this in #38, leaving open as there's more to do there but likely this can be closed when complete