+Changes since 1.6
+=================
+
+New Features:
+* Proofs:
+ * Support for bit-vector proofs with eager bitblasting (older versions only
+ supported proofs with lazy bitblasting).
+* Strings:
+ * Support for `str.replaceall` operator.
+ * New option `--re-elim` to reduce regular expressions to extended string
+ operators, resulting in better performance on regular expression benchmarks
+ (enabled by default).
+* SyGuS:
+ * Support for abduction (`--sygus-abduct`). Given a formula, this option uses
+ CVC4's SyGuS solver to find a sufficient condition such that the
+ conjunction of the condition and the formula is unsatisfiable.
+ * Support for two new term enumerator strategies: variable agnostic
+ (`--sygus-active-gen=var-agnostic`) and fast (`--sygus-active-gen=enum`).
+ By default, CVC4 tries to choose the best term enumerator strategy
+ automatically based on the input (`--sygus-active-gen=auto`).
+ * Support for streaming solutions of increasingly smaller size when using the
+ PBE solver (`--sygus-stream --sygus-pbe`). After the first solution is found
+ and printed, the solver will continue to look for new solutions and print
+ those, if any, that are smaller than previously printed solutions.
+ * Support for unification-based techniques in non-separable specifications
+ (`--sygus-unif`). For solving invariant problems a dedicate mode
+ (`--sygus-unif-boolean-heuristic-dt`) is available that builds candidate
+ solutions using heuristic decision tree learning.
+
+Improvements:
+* Strings:
+ * Significantly better performance on string benchmarks over the core theory
+ and those with extended string functions like substring, contains, and
+ replace.
+
+Changes:
+* API change: Expr::iffExpr() is renamed to Expr::eqExpr() to reflect its
+ actual behavior.
+* Compiling the language bindings now requires SWIG 3 instead of SWIG 2.
+* The CVC3 compatibility layer has been removed.
+* The build system now uses CMake instead of Autotools. Please refer to
+ [INSTALL.md](https://github.com/CVC4/CVC4/blob/master/INSTALL.md) for
+ up-to-date instructions on how to build CVC4.
+
+Changes since 1.5
+=================
+
+New Features:
+* A new theory of floating points.
+* Novel approach for solving quantified bit-vectors (BV).
+* Eager bit-blasting: Support for SAT solver CaDiCaL.
+* A new Gaussian Elimination preprocessing pass for the theory of bit-vectors.
+* Support for transcendental functions (sin, cos, exp). In SMT2 input, this
+ can be enabled by adding T to the logic (e.g., QF_NRAT).
+* Support for new operators in strings, including string inequality (str.<=)
+ and string code (str.code).
+* Support for automated rewrite rule generation from sygus (*.sy) inputs using
+ syntax-guided enumeration (option --sygus-rr).
+
+Improvements:
+* Incremental unsat core support.
+* Further development of rewrite rules for the theory of strings and regular
+ expressions.
+* Many optimizations for syntax-guided synthesis, including improved symmetry
+ breaking for enumerative search and specialized algorithms for
+ programming-by-examples conjectures.
+
+Changes:
+* Eager bit-blasting: Removed support for SAT solver CryptoMinisat 4, added
+ support for CryptoMinisat 5.
+* The LFSC proof checker now resides in its own repository on GitHub at
+ https://github.com/CVC4/LFSC. It is not distributed with CVC4 anymore.
+
+Changes since 1.4
+=================
+
+* Improved heuristics for reasoning about non-linear arithmetic.
+* Native support for syntax-guided synthesis (sygus).
+* Support for many new heuristics for reasoning with quantifiers, including
+ finite model finding.
+* Support for proofs for uninterpreted functions, arrays, bitvectors, and
+ their combinations.
+* Performance improvements to existing theories.
+* A new theory of sets with cardinality and relations.
+* A new theory of strings.
+* Support for unsat cores.
+* Support for separation logic constraints.
+* Simplification mode "incremental" no longer supported.
+* Support for array constants in constraints.
+* Syntax for array models has changed in some language front-ends.
+* New input/output languages supported: "smt2.0" and "smtlib2.0" to
+ force SMT-LIB v2.0; "smt2.5" and "smtlib2.5" to force SMT-LIB v2.5;
+ "smt2.6" and "smtlib2.6" to force SMT-LIB v2.6;
+ "smt", "smtlib", "smt2", and "smtlib2" all refer to the current standard
+ version 2.6. If an :smt-lib-version is set in the input, that overrides
+ the command line.
+* Abstract values in SMT-LIB models are now ascribed types (with "as").
+* In SMT-LIB model output, real-sorted but integer-valued constants are
+ now printed in accordance with the standard (e.g. "1.0").
+
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