Fix changelog.

Author: DylanVann

CHANGELOG.md

@@ -26,15 +26,6 @@
 
 * Fixes WebP rendering on iOS 12. ([#412](https://github.com/DylanVann/react-native-fast-image/issues/412)) ([97630c8](https://github.com/DylanVann/react-native-fast-image/commit/97630c8)), closes [#298](https://github.com/DylanVann/react-native-fast-image/issues/298) [#385](https://github.com/DylanVann/react-native-fast-image/issues/385)
 
-# Changelog
-
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-## [Unreleased]
-
 ## [5.1.2] - 2018-12-30
 
 ### Fixed