Fixes

• Accept a single quote in literal of a URI template. #15
  • Thanks @baywet!

Attention

Any single quote used to be not allowed in literal of a URI template. While
it complies with Section 2.1 of RFC 6570, this behavior sometimes limits the
ability of the URI template. Recently, a discussion with the original RFC
authors has been held, and as a result, an RFC errata to add a single quote as
an allowed literal character has been submitted. While the errata is just
created and has not yet been accepted, the submitter of PR #15 and I decided to
adapt it to support a wide range of use.

• #14
• #15
• https://www.rfc-editor.org/errata/eid6937