Add CHANGELOG

CHANGELOG.rst

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+
+Changelog
+---------
+
+All notable changes to this project will be documented in this file.
+
+The format is based on `Keep a Changelog`_.
+
+  **Types of changes:**
+
+  - **Added**: for new features.
+  - **Changed**: for changes in existing functionality.
+  - **Deprecated**: for soon-to-be removed features.
+  - **Removed**: for now removed features.
+  - **Fixed**: for any bug fixes.
+  - **Security**: in case of vulnerabilities.
+
+
+`UNRELEASED`_
+^^^^^^^^^^^^^
+
+
+Added
+"""""
+
+- The connector ``get_job()`` methods accepts two new parameters for including
+  and excluding specific fields from the response. (#6)
+
+Changed
+"""""""
+
+- The IBMQ Provider has been moved to an individual package outside the
+  Qiskit Terra package.
+- The exception hierarchy has been revised: the package base exception is
+  ``IBMQError``, and they have been grouped in ``.exception`` modules. (#5)
+
+
+
+.. _UNRELEASED: https://github.com/Qiskit/qiskit-ibmq-provider/compare/104d524...HEAD
+
+.. _Keep a Changelog: http://keepachangelog.com/en/1.0.0/