update changelog

Author: loreina

.github/CHANGELOG.md

@@ -5,6 +5,12 @@ 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]
+
+### Added
+
+-   Add route to accept hacker by email
+
 ## [2.1.3](https://github.com/hackmcgill/hackerapi/tree/2.1.3) - 2020-01-11
 
 ### Changed