Version 3.0.6

bump version

bump version

restore windows support

fixes pbhogan#58

update change log

fixes pbhogan#54

Changes:

* Uses more secure defaults: Increased max_mem from 1MB to 16MB, and salt_len from 8 to 32 bytes.
* See discussion at pbhogan#25

The first GEM release to be signed. No code changes.

Changes:

* Adds a `:cost` option for specifying a cost string (e.g. `'400$8$19$'`) from the `calibrate` method
  (pbhogan@95ce6e3)

Version 2.0.0