Update changelog for chacha, hc128 and isaac sub-crates

Author: dhardy

rand_chacha/CHANGELOG.md

@@ -4,5 +4,5 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.1.0] - 2018-09-??
+## [0.1.0] - 2018-10-17
 - Pulled out of the Rand crate

rand_hc128/CHANGELOG.md

@@ -4,5 +4,5 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.1.0] - 2018-09-??
+## [0.1.0] - 2018-10-17
 - Pulled out of the Rand crate

rand_isaac/CHANGELOG.md

@@ -4,5 +4,5 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.1.0] - 2018-07-16
+## [0.1.0] - 2018-10-17
 - Pulled out of the Rand crate