GPL 2.0 License Policy Violation detected in highline-2.0.0.gem

## GPL 2.0 License Policy Violation detected in highline-2.0.0.gem
<details><summary><img src='https://whitesource-resources.whitesourcesoftware.com/vulnerability_details.png' width=19 height=20> Library - highline-2.0.0.gem</summary>

A high-level IO library that provides validation, type conversion, and more for
command-line interfaces. HighLine also includes a complete menu system that can
crank out anything from simple list selection to complete shells with just
minutes of work.

Library home page: <a href="https://rubygems.org/gems/highline-2.0.0.gem">https://rubygems.org/gems/highline-2.0.0.gem</a>


Dependency Hierarchy:
 - jeweler-2.3.9.gem (Root Library)
 - :x: **highline-2.0.0.gem** (Library containing License Policy Violation)
Found in base branch: master

</details>

<details><summary>:page_with_curl: License Details</summary>
 
 
<a href='http://www.opensource.org/licenses/GPL-2.0'>GPL 2.0</a> 
License Reference File: <a href='https://index.whitesourcesoftware.com/gri/app/reader/resource/content/asString/3cff6d2d-ae0e-4806-9be4-97bd1ea38b21'>https://index.whitesourcesoftware.com/gri/app/reader/resource/content/asString/3cff6d2d-ae0e-4806-9be4-97bd1ea38b21</a>


</details>

&nbsp;&nbsp;&nbsp; :no_entry: License Policy Violation - No GPL

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GPL 2.0 License Policy Violation detected in highline-2.0.0.gem #42