module fix

Nil target support

Nil target support

Nil target support

fix pointers when convert types is enabled

fix patch assignment to pointer values

safely interface reflect values (r3labs#70)

Fix private map (r3labs#68)

* move tests to their own package

* fix private maps

* access private struct interface values

Add arrays to diff (r3labs#66)

* add support for arrays

fix struct assignment when value is zero