typo fixes
Fix DEPRECATED warning in tests after Mojo v4.50
Fix Token Extraction

When "charset" is included in Content-Type header, token extraction failed.  This corrects that behaviour.
Condensed Content-Type Validation.
Merge pull request #24 from valchonedelchev/master

Fix DEPRECATED warning in tests after Mojo v4.50
Merge pull request #25 from SailingYYC/patch-1

Fix Token Extraction
Merge pull request #23 from dsteinbrunner/patch-1

typo fixes
Prepare to release, pending https://github.com/marcusramberg/Mojolicious-Plugin-OAuth2/pull/26
Ability to change Host.

Several services (eg. Shopify) use different hosts to access the API end-points of, and authenticate to, different user accounts.  This is a small patch to permit altering the host on a request by request basis but keep the remainder of the API end-points consistent.