Bundle issue on Windows with MsgPack dependency with Ruby 2.6

[mattheworiordan]

Customer reported a bundle issue with ruby 2.6 on windows

Resolving dependencies.....
Bundler could not find compatible versions for gem "unf_extmsgpack":
In Gemfile:
rest-client (~> 2.0, >= 2.0.2) was resolved to 2.0.2, which depends on
http-cookie (>= 1.0.2, < 2.0) was resolved to 1.0.3, which depends on
domain_name (~> 0.5) was resolved to 0.5.20180417, which depends on
unf (>= 0.0.5, < 1.0.0) was resolved to 0.1.4, which depends on
unf_extmsgpack

Could not find gem 'unf_extmsgpack', which is required by gem 'unf (>= 0.0.5, <
1.0.0)', in any of the sources.

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