PSL update: tools: update newgtlds.go to filter removed gTLDs (#860)

[layershifter]

tools: update newgtlds.go to filter removed gTLDs (#860)

• tools: update newgltds.go to filter removed gTLDs.

When an entry has a non-empty RemovalDate it indicates the gTLD

delegation has been removed from the root zones. In such a case even if

the gTLD contract has not been terminated the gTLD isn't in use and

should be removed from the public_suffix_list.dat gTLD section.

• newGTLDs: delete gTLDs that have been removed.

• .bnl -> removed 2019-07-30

• .iselect -> removed 2019-08-05

• .starhub -> removed 2019-08-02