Add CHANGELOG.md #39.

CHANGELOG.md

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+# Changelog
+
+## [1.1.1] - 2020-02-06
+- added `environment.yaml` to install initial dependencies via Conda
+  - updated Xenon CLI (v3.0.4): `--cores-per-task {threads}` replaces `--procs-per-node {threads}` and `--start-single-process` args
+  - included jq JSON processor to query job accounting output by Xenon CLI (optional)
+- updated Docker images with batch schedulers for CI testing
+- fixed file error handling and unit tests
+
+## [1.1.0] - 2019-05-06
+- enabled both single-sample (germline) and paired-sample (somatic) SV analyses
+- added post-processing steps (i.e., SV quality filtering and/or excluding regions with problematic mappability)
+- updated Xenon CLI (v3.0.0) and included optional use of temporary disk space
+- added Docker images with batch schedulers for CI testing
+- bug fixes
+
+## [1.0.0] - 2018-04-11
+- initial release supporting SV detection in paired tumor/normal samples