fix changelog

Author: eli-darkly

CHANGELOG.md

@@ -10,15 +10,6 @@ All notable changes to the LaunchDarkly Java SDK will be documented in this file
 ### Changed:
 - Updated documentation comment for `intVariation` to clarify the existing rounding behavior for floating-point values: they are rounded toward zero.
 
-
-## [4.8.0] - 2019-09-27
-### Added:
-- Added support for upcoming LaunchDarkly experimentation features. See `LDClient.track(String, LDUser, JsonElement, double)`.
-
-### Changed:
-- Updated documentation comment for `intVariation` to clarify the existing rounding behavior for floating-point values: they are rounded toward zero.
-
-
 ## [4.7.1] - 2019-08-19
 ### Fixed:
 - Fixed a race condition that could cause a `NumberFormatException` to be logged when delivering event data to LaunchDarkly (although the exception did not prevent the events from being delivered).