version bump of tools used

README.md

@@ -16,12 +16,12 @@ https://gitlab.science.ru.nl/sovereign/why3-avr/tree/master
 
 ## Checking the proofs
 
-The proofs were developed using Why3 0.87.2; as well as the following theorem provers:
+The proofs were developed using Why3 0.87.3; as well as the following theorem provers:
 
 * Alt-Ergo 1.01
 * CVC3 2.4.1
 * CVC4 1.4 
 * Eprover 1.8
-* Z3 4.4.1
+* Z3 4.5.0
 
 Then, simply running `why3 replay -L . avr_code` should work.