Add changelog

Author: timoast

CHANGELOG.md

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+# 1.3.0
+
+- Add `--pic` option for paired insertion counting to `fragtk matrix`
+
+# 1.2.0
+
+- Update command line interface
+- Allow input BED file for `fragtk matrix` to be gzipped
+- Add `--ncell` option to `fragtk count`
+
+# 1.1.0
+
+Performance improvements
+
+# 1.0.0
+
+First release