Release 2.8.0

Fix flattening in arrays starting with null

Co-Authored-By: Albert Boada <albert.boada.flaquer@gmail.com>

Fix SyntaxErrorException throwing ValueError in PHP 8 (#72)


Co-authored-by: Graham Campbell <GrahamCampbell@users.noreply.github.com>

Release 2.6.0

Release 2.5.0

* Added support for floats when interpreting data.

* Added a function_exists check to work around redeclaration issues.

* Added support for [JEP-9](https://github.com/jmespath/jmespath.site…

…/blob/master/docs/proposals/improved-filters.rst),

  including unary filter expressions, and `&&` filter expressions.
* Fixed various parsing issues, including not removing escaped single quotes
  from raw string literals.
* Added support for the `map` function.
* Fixed several issues with code generation.

* Added support for [JEP-12](https://github.com/jmespath/jmespath.sit…

…e/blob/master/docs/proposals/raw-string-literals.rst)

  and raw string literals (e.g., `'foo'`).

* Added `JmesPath\Env::cleanCompileDir()` to delete any previously co…

…mpiled

  JMESPath expressions.

* Moving to a flattened namespace structure.

* Runtimes are now only PHP callables.
* Fixed an error in the way empty JSON literals are parsed so that they now
  return an empty string to match the Python and JavaScript implementations.
* Removed functions from runtimes. Instead there is now a function dispatcher
  class, FnDispatcher, that provides function implementations behind a single
  dispatch function.
* Removed ExprNode in lieu of just using a PHP callable with bound variables.
* Removed debug methods from runtimes and instead into a new Debugger class.
* Heavily cleaned up function argument validation.
* Slice syntax is now properly validated (i.e., colons are followed by the
  appropriate value).
* Lots of code cleanup and performance improvements.
* Added a convenient `JmesPath\search()` function.
* **IMPORTANT**: Relocating the project to https://github.com/jmespath/jmespath.php