Hist lists the changes and NEWS in the documentations.

Features:

• 2019-09-05 Add the LCA model
• 2019-09-21 Add 2-D diffusion model and CDDM and HCDDM
• 2019-09-28 Add PM Model in Cognitive Model.
• 2019-11-26 Update mle.md for S4 class
• 2019-12-02 Update one-participant.md for using S4 class