v0.1 (December 19, 2018): Initial version
v0.2 (December 21, 2018): Added participant registration deadline in Section 9 "Schedule"; added rules concerning data use and data augmentation in Section 7
v0.3 (January 04, 2019): Corrected a few errors in Section 11 "Acknowledgement".
v0.4 (January 15, 2019): Added new Section 9 "ASVspoof 2019 special session at Interspeech 2019". Added some clarifications about detection scores in Section 5. Added some clarifications about t-DCF metric in Section 5.1. Added some clarifications on the usage of the training data in Section 7.