Update CHANGELOG.md

Author: LegNeato

juniper_hyper/CHANGELOG.md

@@ -1,6 +1,6 @@
 # master
 
-- Compatibility with the latest `juniper`.
+- **[Breaking change]** Remove unneccesary `Result`s ([#889](https://github.com/graphql-rust/juniper/pull/889))
 
 # [[0.6.3] 2021-01-27](https://github.com/graphql-rust/juniper/releases/tag/juniper_hyper-0.6.3)