Updated changelog for 0.1.4.

Author: jeromekelleher

python/CHANGELOG.rst

@@ -1,3 +1,17 @@
+--------------------
+[0.1.4] - 2019-02-01
+--------------------
+
+Minor feature update. Using the C API 0.99.1.
+
+**New features**
+
+- Add interface for setting TableCollection.sequence_length:
+  https://github.com/tskit-dev/tskit/issues/107
+- Add support for building and dropping TableCollection indexes:
+  https://github.com/tskit-dev/tskit/issues/108
+
+
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 [0.1.3] - 2019-01-14
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