Update list for Gammadyne Mailer

Gammadyne Mailer 50.0 changelog from December 1, 2016

Added the "Operation History" tool.

Gammadyne Mailer 49.0 changelog from August 12, 2016

Added the "Mobile Preview" tool.

Gammadyne Mailer 48.0 changelog from March 7, 2016

Added support for unicode mailing lists.

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