Add CHANGELOG and post-release v1.1

Author: Jan Ludwiczak

CHANGELOG.md

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+## Changelog
+
+### v.1.1
+Added output filtering options <code>-min_residue_score</code> and <code>-min_segment_length</code>.
+
+### v1.0
+Initial release - corresponds to the version presented in the original paper [DOI:10.1093/bioinformatics/bty1062](https://doi.org/10.1093/bioinformatics/bty1062)
+