Getting redirect when fatching campaigns

[SirSkaro]

When attempting to use the PatreonAPI#fetchCampaigns, I am getting the following response:

<title>Redirecting...</title>
<h1>Redirecting...</h1>
<p>You should be redirected automatically to target URL: <a href="http://www.patreon.com/oauth2/api/current_user/campaigns?include=rewards%2Ccreator%2Cgoals">http://www.patreon.com/oauth2/api/current_user/campaigns?include=rewards%2Ccreator%2Cgoals</a>.  If not click the link.

The library is initially trying to hit the url https://www.patreon.com/api/oauth2/api//current_user/campaigns?include=rewards%2Ccreator%2Cgoals. I haven't made changes to my client code in almost 3 years, so I'm assuming there was an API change?

[EtienneLamoureux]

Same problem here: the library constructs paths with a faulty double-slash // after the /api part of the URL. Hitting the correct path manually without the double slash returns the expected result.

In my case, this segment of code created /campaigns/<campaign id>/pledges?page%5Bcount%5D=15 (notice the starting slash), which is then appended here to /api/oauth2/api/ (notice the trailing slash) and creates the problematic path containing // in the middle the URL. This results in the full final URL being https://www.patreon.com/api/oauth2/api//campaigns/<campaign id>/pledges?page%5Bcount%5D=15, which returns an HTML error page when called as-is.

[EtienneLamoureux]

This would be fixed by #34 or the solution it suggests.

Edit: created a PR myself. See #41