Added change log

Author: Daniel Standage

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/).
+
+## [0.2] 2019-05-21
+
+### Added
+- New `getrefr` module for installing human reference genome (see #30).
+- Improved error handling related to BAM index files (see #31).
+
+### Changed
+- Replaced pip/PyPI installation instructions with bioconda installation instructions (see 1b61c59200).
+
+### Fixed
+- Corrected usage statement for `mhpl8r contrib` (see #31).
+
+
+## [0.1.3] 2019-05-14
+
+- mark failing test
+- exclude `__init__.py` from test invocation
+
+
+## [0.1.2] 2019-05-07
+
+Updating file manifest, troubleshooting bioconda build.
+
+
+## [0.1.1] 2019-05-07
+
+Minor fix to `setup.py` for distribution purposes.
+
+
+## [0.1] 2019-05-02
+
+Initial release of MicroHapulator!
+
+Command-line entry point: `mhpl8r`
+Command-line operations:
+- `contrib`: estimate number of contributors in a sample
+- `dist`: compute naive Hamming distance between two sample genotypes
+- `mixture`: simulate a multiple-contributor sample
+- `refr`: retrieve reference genome cutouts for a specified microhap panel
+- `sim`: simulate a single-contributor sample
+- `type`: infer genotype from mapped reads