vpr: Record breadth-first router deprecation in change log

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 277cbba..dbdcfcc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,6 +42,7 @@
 ### Fixed
 
 ### Deprecated
+ * VPR's breadth-first router (use the timing-driven router, which provides supperiour QoR and Run-time)
 
 ### Removed