0.4.0: Annotations performance

• Optimized runtime performance by including annotations as
  metadata inside code, see issue #1.
  (@thekid)
• Fixed annotation parsing - @thekid
• Made xp help compile display something useful - @thekid
• Fixed compatibility with XP7 console streaming - @thekid

0.3.0: Compile subcommand

• Registered xp compile subcommand - @thekid
• Simulated yield from in PHP 5.6 in a limited fashion - @thekid
• Added support for nullable types from PHP 7.1 - @thekid
• Implemented short list(...) syntax from PHP 7.1 - @thekid
• Added support for anonymous classes from PHP 7.0 - @thekid
• Implemented constant modifiers from PHP 7.1 - @thekid
• Added support for comparison operator <=> from PHP 7.0 - @thekid
• Added support for object typehint from PHP 7.2 - @thekid

0.2.0: PHP version specific handling

• Add factory to retrieve emitter for a given PHP runtime - @thekid
• Extract PHP version specific handling to dedicated classes - @thekid
• Ensure compiled code can be loaded for annotation parsing - @thekid

0.1.0: Hello World

• First public release - @thekid