Upgrade to RubyZip 1.1.0 to resolve installation problems with newer gems.

[akshayrawat]

IronWorker uses an ancient and exact version of RubyZip 0.9.9 (released June 17, 2012). Most recent gems need RubyZip 1.0.x (released Aug, 2013) or higher. This results in installation problems when the IronWorker gem is to be used with such gems.

Lets upgrade this gem to use the RubyZip ~> 1.1.0

[akshayrawat]

I'm not sure why the RubyZip version was downgraded - 2d2d62a

[treeder]

Ya, we need to figure this out, I can't remember why we reverted it.

[treeder]

I made pull request #185 to upgrade rubyzip, but I'm a little weary since I don't know the reason why it was downgraded in the first place.

[gtd]

FWIW, rubyzip <= 1.2.0 has a serious security vulnerability: https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-5946