Updating CHANGELOG

Marking 1.0.2

Marking 1.0.1

Marking 1.0.0 (CTFd#196)

* Use <int:xxx> in routes to prevent some errors 500 (CTFd#192)

* Use first_or_404() to prevent some errors 500 (CTFd#193)

* Add a populating script for awards. (CTFd#191)

* Creating upload_file util

* Marking 1.0.0 in __init__ and starting database migrations

* Upgrading some more HTML

* Adding CHANGELOG.md