[changes] Added changelog

CHANGELOG.md

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+# CHANGES
+
+## Unreleased
+
+
+
+## 0.6
+
+### Feature
+
+- An already instantiated sat solver in the Sat module
+- A `full_slice` function for running possibly expensive satisfiability
+  tests (in SMT) when a propositional model has been found
+- Forgetful propagations: propagations whose reason (i.e clause) is not watched
+
+## 0.5.1
+
+### Bug
+
+- Removed some needless allocations
+
+### Breaking
+
+- Better interface for mcsat propagations
+
+### Feature
+
+- Allow level 0 semantic propagations
+
+## 0.5
+
+### Bug
+
+- Grow heap when adding local hyps
+- Avoid forgetting some one atom clauses
+- Fixed a bug for propagations at level 0
+- Late propagations need to be re-propagated
+- Fixed conflict at level 0
+- Avoid forgetting some theory conflict clauses
+
+### Breaking
+
+- Changed `if_sat` interface
+
+## 0.4.1
+
+### Bug
+
+- fix bug in `add_clause`
+
+## 0.4
+
+- performance improvements
+- many bugfixes
+- more tests
+
+### Breaking
+
+- remove push/pop (source of many bugs)
+- replaced by solve : assumptions:lit list -> unit -> result
+
+### Features
+
+- Accept late conflict clauses
+- cleaner API, moving some types outside the client-required interface
+
+## 0.3
+
+### Features
+
+- Proofs for atoms at level 0
+- Compatibility with ocaml >= 4.00
+- Released some restrictions on dummy sat theories
+
+## 0.2
+
+### Breaking
+
+- Log argument has been removed from functors
+- All the functors now take a dummy last argument to ensure the solver modules are unique
+
+### Features
+
+- push/pop operations
+- access to decision level when evaluating literals
+