Update CHANGELOG.md

CHANGELOG.md

@@ -1,11 +1,16 @@
 ## [1.8.9](https://github.com/iamkun/dayjs/compare/v1.8.8...v1.8.9) (2019-03-06)
 
 
-### Bug Fixes
+### Features
 
-* Add de-AT locale ([#515](https://github.com/iamkun/dayjs/issues/515)) ([d93f7b6](https://github.com/iamkun/dayjs/commit/d93f7b6))
 * Add UTC mode with UTC plugin ([#517](https://github.com/iamkun/dayjs/issues/517)) ([caf335c](https://github.com/iamkun/dayjs/commit/caf335c))
-* Adding locale zh-hk ([#516](https://github.com/iamkun/dayjs/issues/516)) ([5fc05a6](https://github.com/iamkun/dayjs/commit/5fc05a6))
+
+> For plugin developers: Please note, we have changed the name of some method in `Utils` in order to reduce the file size. ([#517](https://github.com/iamkun/dayjs/issues/517)) ([detail](https://github.com/iamkun/dayjs/pull/517/files#diff-2b4ca49d4bb0a774c4d4c1672d7aa781R46))
+
+### Bug Fixes
+
+* Add locale de-AT ([#515](https://github.com/iamkun/dayjs/issues/515)) ([d93f7b6](https://github.com/iamkun/dayjs/commit/d93f7b6))
+* Add locale zh-hk ([#516](https://github.com/iamkun/dayjs/issues/516)) ([5fc05a6](https://github.com/iamkun/dayjs/commit/5fc05a6))
 
 ## [1.8.8](https://github.com/iamkun/dayjs/compare/v1.8.7...v1.8.8) (2019-02-25)