Merge pull request #741 from ethereum/update-cvc4-to-cvc5

Update cvc4 to cvc5

Author: r0qs

README.md

@@ -152,7 +152,7 @@ return either an error or the result from the solver.  A default
 ``smtchecker.js`` which exports the ``smtCallback`` function that takes 1) a
 function that takes queries and returns the solving result, and 2) a solver
 configuration object. The module ``smtsolver.js`` has a few predefined solver
-configurations, and relies on Z3, Eldarica or CVC4 being installed locally.  It
+configurations, and relies on Z3, Eldarica or cvc5 being installed locally.  It
 exports the list of locally found solvers and a function that invokes a given
 solver.
 

smtsolver.ts

@@ -18,8 +18,8 @@ const potentialSolvers = [
     params: '-horn -t:' + (timeout / 1000) // Eldarica takes timeout in seconds.
   },
   {
-    name: 'cvc4',
-    command: 'cvc4',
+    name: 'cvc5',
+    command: 'cvc5',
     params: '--lang=smt2 --tlimit=' + timeout
   }
 ];