Update list for dbExpress driver for MySQL

dbExpress driver for MySQL 6.8 changelog from June 14, 2016

* RAD Studio 10.1 Berlin is supported

dbExpress driver for MySQL 6.7 changelog from October 18, 2015

* RAD Studio 10 Seattle is supported

dbExpress driver for MySQL 6.6 changelog from May 18, 2015

* RAD Studio XE8 is supported

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