Release asciidoctor-go v0.1.1 (2021-12-06)

=== Bug fixes

*  all: fix parsing and rendering cross reference

   Previously, when parsing cross reference we assume that if the string
   contains upper-case letter then it's a label so we store it as title
   to search for ID later.

   The bug is when ID is set manually and its contains upper-case for
   example "[#Id]".

   This changes fix this issue by storing cross reference first, not
   assuming it as ID or title, and then when doing rendering we check
   whether its ID or title.

*  all: allow colon ':' and  period '.' on the ID

   According to XML spec [1], the colon is allowed as the first and the next
   character.  While period is only allowed on the next characters.

   [1] https://www.w3.org/TR/REC-xml/#NT-Name
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