Release ciigo v0.6.0 (2021-04-07)

===  Breaking changes

* all: change the Convert function to use type ConvertOptions

  Previously, we pass the directory to be scanned for asciidoc markup files
  and path to HTML template on Convert function.  Adding new option to
  Convert will cause changes on the Convert signature.

  To prevent this, we changes the Convert signature from multiple parameters
  into single parameter ConvertOptions.

  While at it, change the variable name HTMLTemplate to HtmlTemplate.

* all: change the Serve signature to ServeOptions

  Previously, we pass four parameters to Serve function: the instance
  to memfs.MemFS, the root directory, the address to listen, and
  path to HTML template.

  In case we need to add new parameter in the future, the Serve function
  signature will changes and this is not good for consumer of API.

  This commit changes the Serve function parameters to ServeOptions
  so we can add optional parameter in the future without changes to its
  signature.

* all: changes the Watch signature to use ConvertOptions

  Just like changes on Convert function, this is to prevent additional
  parameter added on Watch function affect the consumer of API in the
  future.

===  New features

* all: add option to exclude certain paths using regular expression

  The ConvertOptions now has the Exclude field that can contains regular
  expression.  If the Exclude is not empty, it will be compiled and use
  in Convert, Generate, Watch, and Serve; to ignore specific paths
  being scanned.

=== Enhancements

* all: exclude common file and directories names for being watched

  By default, any hidden files on Unix like system, which start with dot '.'
  should not be watched for any changes.  So does "node_modules" from npm
  and "vendor" directory which may contains many unrelated files.
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