Update version history for 5.0.2

Release date is subject to change.
Fix 5.0.2 release date
Merge pull request #1114 from melissalinkert/version-history

Update version history for 5.0.2
Update auto-generated documentation

Repository: openmicroscopy/bioformats
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Generated by BIOFORMATS-5.0-latest-docs-autogen#220 (http://ci.openmicroscopy.org/job/BIOFORMATS-5.0-latest-docs-autogen/220/)