Interface changes

• The contract of the base Bender interface Rule has been relaxed: AnyObject parameters are now Any;
• Added forceOptional methods to ObjectRule (thanks @dydus0x14 ) to force putting/getting "null" value if needed;
• Swift 5;

1.6.1 Swift 5 and Swift 4.x compatibility

• Added Swift 5 and Swift 4.x compatibility
• Made all the public interfaces "open"

1.5.2 Memory consumption reduced

In some cases the memory was not freed until the rule validation is finished, which could lead to a huge peak memory consumption. Fixed.

1.5.1 Performance improvements

Mapping performance has been dramatically improved.

1.5.0

• Added Swift 3 compatibility. For Swift 2.2 use 1.4.0.
• Added ability to have array indices as part of a JSON path