Release ciigo v0.7.0 (2021-12-06)

Changes on asciidoctor-go,

*  all: fix parsing and rendering cross reference
*  all: allow colon ':' and  period '.' on the ID

===  Breaking changes

*  all: refactoring with latest share module

   The latest share module use the term GoEmbed to generate Go source file.
   In order for this repo in sync with upstream terminology and to minimize
   confusion, we changes the exported function and command name from
   "generate" to "embed", this includes

   * Command "ciigo generate" become "ciigo embed"
   * Exported function to generate Go renamed from "Generate" to "GoEmbed".
     This include the parameter GenerateOptions which renamed to
     EmbedOptions.
   * The internal command to generate example renamed from "generate" to
     "goembed"

===  Bug fixes

*  all: add missing new line when printing file to be converted

*  all: fix empty fileMarkups on watcher

   Previously, when user call ciigo.Watch(), and the markup file changes,
   the onChangeFileMarkup method will print an error "xyz not found" which
   cause the markup file not converted.

   This is caused by watcher.fileMarkups is empty.

   This changes fix this issue by initializing the fileMarkups field using
   listFileMarkups, so the next callback to onChangeFileMarkup can detect
   the changed file and convert it.

*  This update fix HTTP server caching using ETag.

===  Enhancements

*  all: check markup modification time before converting to HTML

   Previously, when the Convert, Watch or Serve running it will convert
   all markup files into HTML without checking if the adoc has been modified
   or newer than HTML file.

   This changes check the modification time of markup file first before
   converting them, to minimize unnecessary operation.
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