chore(release): 0.7.3 - #38

Changelog for 0.7.3.

• RUM: the remote configuration cache key no longer includes the app version (fix(rum): keep remote settings across app upgrades #37), so the first session after an app upgrade keeps the previously stored settings instead of the init values.

The version is taken from the v0.7.3 tag (AndroidConfig.parseVersionFromTag), so this only adds the changelog entry, like the 0.7.2 release.

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