Added CHANGELOG.md

Author: glynos

CHANGELOG.md

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+# Changelog
+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](http://semver.org/spec/v2.0.0.html).
+
+## [1.0.1] - 2018-08-11
+### Changed
+- Build defaults to C++11
+
+### Fixed
+- Fix to `network::uri_builder` to allow URIs that have a scheme and absolute path
+- Other minor bug fixes and optimizations
+
+## [1.0.0] - 2018-05-27
+### Added
+- A class, `network::uri` that models a URI, including URI parsing on construction
+  according to [RFC 3986](https://tools.ietf.org/html/rfc3986)
+- A class, `network::uri_builder` that allows a user to construct valid URIs
+- Member functions to allow URI normalization, resolution, and comparison
+- Support for URI percent encoding