CHANGES.rst: add release notes for 1.0.6

CHANGES.rst: add release notes for 1.0.5

CHANGES.rst: add release notes for 1.0.4

CHANGES.rst: add release notes for 1.0.3

CHANGES.rst: add release notes for 1.0.2

CHANGES.rst: add release notes for 1.0.1

CHANGES.rst: add release notes for 1.0.0

CHANGES.rst: add release notes for 1.0.0rc1

CHANGES.rst: add version 0.3.8 changes

CHANGES.rst: add release notes for version 0.3.7