Release.1.5.0.adoc

Besides a number of minor bug fixes and perf improvement, most notable changes

Bundled Reason together thanks to Reason team, so that Reason syntax support is also first class,

this also makes Reason for the first time available to Windows users.

FFI added bs.uncurry which will automatically uncurry the callback so the user land API is clearer

see http://bucklescript.github.io/bucklescript/Manual.html#__bs_uncurry_for_implicit_uncurried_callback_since_1_5_0

Improve object label translation to cause less surprise, this might case minor backward compatibility http://bucklescript.github.io/bucklescript/Manual.html#_object_label_translation_convention