Init of Change Log.

Summary: The Change Log is initialized. For every new feature, improvement, bug fix and anything else that is relevant, please update the CHANGELOG.md file.

Reviewers: teon.banek, mislav.bradac, florijan, dgleich

Reviewed By: dgleich

Subscribers: pullbot, buda

Differential Revision: https://phabricator.memgraph.io/D379

CHANGELOG.md

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+# Change Log
+
+## Next Build
+
+### Major Features and Improvements
+
+TODO
+
+### Bug Fixes and Other Changes
+
+TODO
+
+## Build 825
+
+### Major Features and Improvements
+
+* RETURN *, count(*), OPTIONAL MATCH, UNWIND, DISTINCT (except DISTINCT in aggregate functions), list indexing and slicing, escaped labels, IN LIST operator, range function
+
+### Bug Fixes and Other Changes
+
+* TCP_NODELAY -> import should be faster
+* Clear hint bits
+
+## Build 783
+
+### Major Features and Improvements
+
+* SKIP, LIMIT, ORDER BY
+* Math functions
+* Initial support for MERGE clause
+
+### Bug Fixes and Other Changes
+
+* Unhandled Lock Timeout Exception
+
+## Build 755
+
+### Major Features and Improvements
+
+* MATCH, CREATE, WHERE, SET, REMOVE, DELETE