=== 0.1.0 / 2013-02-04

* Initial release:
** Delay line
** Biquad filters
** Envelope detector
** Conversion from dB-linear and linear-dB
** Linear interpolation
** Oscillator with selectable wave type (sine, square, triangle, sawtooth)

=== 0.1.1 / 2013-02-04

Add EnvelopeDetector#attack_time= and EnvelopeDetector#release_time=