Update README.md

Author: sethlilly

README.md

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+# Ghost 2.0 Compatibility
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+[Vapor 1.6](https://github.com/sethlilly/Vapor/releases/tag/v1.6.0) is compatible with Ghost 2.0. Thanks to [jamesejr](https://github.com/jamesejr) for making this happen!
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 # Deprecation Notice
 
 **UPDATE 2018-08-22**: Remember when I said 1.5 would be the last release in the 1.x series? Yeah, scratch that. Thanks to [jamesejr](https://github.com/jamesejr) for the PR featured in the [1.6 release](https://github.com/sethlilly/Vapor/releases/tag/v1.6.0) to provide Vapor compatibility with Ghost 2.0.