DDlog v0.39.0

[0.39.0] - April 11, 2021

D3log

• Experimental compiler support for D3log (wip).

New features

• We now support rules that don't start with a positive literal, e.g.,

  R() :- not R2(...).
  R() :- var x = 5.
  

Bug fix

• Delete old Rust files in the generated project. This prevents compilation
  errors when upgrading to a new version of DDlog.