Add a changelog to our branch

Author: Rafa de la Torre

CHANGELOG.carto.md

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+# Changelog
+
+## next
+
+**Release date**: TBD
+
+Changes:
+ - Add this very changelog
+ - Allow SQL functions to inline in the presence of costly parameter functions (planned)
+ - Parallel planning improvement for costly functions on target list (planned)
+
+
+## 10.1+carto-2
+
+**Release date**: 2017-11-29
+
+Changes:
+ - Make execution of plpython interruptible [4796880](https://github.com/CartoDB/postgres/commit/4796880d942680cc3685cc8d314c6f706c9b4826)
+
+
+## REL_10_1
+
+**Release date**: 2017-11-09
+
+Vanilla PostgreSQL 10.1 in which the rest of the code is based upon. See https://www.postgresql.org/docs/10/static/release.html