change.log

1.0 Beta:
- Do not support pointer, slice, map, channel, function and interface as key. If you want to use these types as key, can implements Hashable interface.
- Add Hashable interface to support customize hash code and equals logic
- Add Update method to allow safely use composition operation to update the value from multiple threads
- Remove NextEntry method of MapIterator, and add Next() method to return key, value and ok flag
- Add ToSlice method that returns an Entry slice