fix: added hover effect to 'edit tag' button

[atom-goliver]

Closes https://github.ibm.com/ibmcloud/pup-contractor/issues/42

Adds a hover effect to the pencil icon on the tag list.

Changelog

Changed

• Added a hover effect to the "edit" icon (pencil) on the tag list component

[joshblack]

:tada: This PR is included in version 3.0.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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