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Release 0.9.0 in changelog

doc: prepare release notes for 0.9.0

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Update changes for 0.7.0 release

Update changes for 0.6.0 release

fix: loading translations via changed date (#44)

When using the units API and getting the translations via
`"changed:>=YYYY-MM-DD"` you will not get all translations wanted.
Translations which were only once touched get only an added date.
So, those translations will not be fetched.

This changes query for the `changed` and `added` fields to fix this.

Fixes #43

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