Add change log

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+
+## [Unreleased]
+
+### Added
+
+- `refute()` to complement `assert()`
+- `npm` support
+
+### Fixed
+
+- Not consuming the `--` when stopping option parsing in
+  `assert_output`, `refute_output`, `assert_line` and `refute_line`
+
+
+## 0.1.0 - 2016-02-16
+
+### Added
+
+- Reporting arbitrary failures with `fail()`
+- Generic assertions with `assert()` and `assert_equal()`
+- Testing exit status with `assert_success()` and `assert_failure()`
+- Testing output with `assert_output()` and `refute_output()`
+- Testing individual lines with `assert_line()` and `refute_line()`
+
+
+[Unreleased]: https://github.com/ztombol/varrick/compare/v0.1.0...HEAD