[eacsl] Update changelog

src/plugins/e-acsl/doc/Changelog

@@ -25,6 +25,8 @@
 Plugin E-ACSL <next-release>
 ############################
 
+-* E-ACSL       [2021-07-16] Fix crash when using some built-in labels
+                (frama-c/e-acsl#173).
 -  E-ACSL       [2021-07-06] Add support for the extended quantifier \sum.
 -* E-ACSL       [2021-06-22] Fix a crash that occured when using certain
                 combinations of nested blocks and annotations.