Added a changelog.

Author: thejpster

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).
+
+## [Unreleased]
+
+Added this Changelog.
+
+## [0.10.2]
+
+Merged in [#17](https://github.com/thejpster/rust-measurements/pull/17) to add:
+
+* nanoamps
+* microwatts
+* milliwatts
+* microvolts
+
+## [0.10.1]
+
+The tests now work correctly after the `#[no_std]` move.
+
+## [0.10.0]
+
+Now builds for `#[no_std]` targets.
+
+## [0.9.0]
+
+Adds:
+
+* Electrical Current (in Amps)
+* Electrical Resistance (in Ohms)
+* Corresponding updates to Power and Voltage
+
+## [0.8.0]
+
+Added the Voltage type, in Volts.
+
+## [0.7.0]
+
+Uses the [time](https://crates.io/crates/time) crate, to avoid `std::time` (which isn't available with `#[no_std]`).
+
+## [0.6.0]
+
+Adds:
+
+* Angles
+* Angular Velocity
+* Area
+* Data (bytes, etc)
+* Force
+* Frequency
+* Mass
+* Metric Horsepower (PS)
+
+Changed Pressure to be in Pascals. Also add a bunch of tests and doc fixes.
+
+[Unreleased]: https://github.com/thejpster/rust-measurements/compare/v0.10.2...HEAD
+[0.10.2]: https://github.com/thejpster/rust-measurements/compare/v0.10.1...v0.10.2
+[0.10.1]: https://github.com/thejpster/rust-measurements/compare/v0.10.0...v0.10.1
+[0.10.0]: https://github.com/thejpster/rust-measurements/compare/v0.9.0...v0.10.0
+[0.9.0]: https://github.com/thejpster/rust-measurements/compare/v0.8.0...v0.9.0
+[0.8.0]: https://github.com/thejpster/rust-measurements/compare/v0.7.0...v0.8.0
+[0.7.0]: https://github.com/thejpster/rust-measurements/compare/v0.6.0...v0.7.0
+[0.6.0]: https://github.com/thejpster/rust-measurements/compare/v0.2.1...v0.6.0