Update list for NetShred X

NetShred X 5.2.1 changelog from October 9, 2017

Adds support for Firefox 56

NetShred X 5.1 changelog from August 23, 2017

Adds support for Firefox 55, Adds support for Chrome 59

NetShred X 5.0.8 changelog from May 15, 2017

Adds support for Firefox 52

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