ppm v0.3.0

Added the capacity to generate from the PPM models.

ppm v0.2.0

• Added NEWS.md.
• Extended regression tests to cover all escape methods in the standard PPM model.
• Fixed implementation issues in escape methods B and D in the standard PPM model.

ppm v0.1.1

Increment version number

ppm v0.1.0

Update README.md

v0.0.0.9000

Documenting 'only_learn_from_buffer'