v0.4.0

• Migrated to null safety.

v0.3.0

• Added an option to create case insensitive regular expressions.

• Added a getter named regExp to ParameterToken for the regular expression
  used to match arguments.

• Updated lower SDK constraint to 2.3.0.

v0.2.1

• Removed unnecessary code.

• Added an example.

• Included package:pedantic/analysis_options.yaml.

v0.2.0

• Removed support for optional parameters.