Bump listen from 3.1.5 to 3.2.1

[dependabot-preview[bot]]

Bumps listen from 3.1.5 to 3.2.1.

Release notes

Sourced from listen's releases.

v3.2.0

• Fix warnings in spec output (#464) @floehopper
• README: Remove defunct Gemnasium badge (#461) @olleolleolle
• Update the RuboCop dependency (#447) @rymai
• ⚠ assigned but unused variable - from_change, to_change (#438) @amatsuda
• Update dependencies and travis matrix (#446) @rymai
• Upgrade to latest rb-fsevent and rb-notify releases (#443) @thibaudgg
• Update Natalie’s name (#433) @ddfreyne
• Fix small markdown syntax issue in README (#430) @sivaraam
• Update .travis.yml (#427) @junaruga
• update travis.yml (bump ruby + bundler cache) (#395) @e2
• set Travis to MRI 2.2.5 and JRuby 9.1.2.0 (#408) @e2
• Require rb-fsevent when needed, in _configure method (#419) @jirutka
• Update matrix to use Ruby 2.2.5 (#418) @rymai
• Don't require rb-fsevent until actually needed (#417) @jirutka
• Please the 👀 with retina friendly badges (#413) @elia
• [ci skip] Document behavior in forked environment (#403) @schneems

Commits

• 4f9e75f Remove gem which pulls in very old dependencies.
• ebbf50c Simplify travis configuration.
• d8d8038 Bump version.
• e5a14cf Merge pull request #471 from guard/reduce_multiple_fsevent_processes
• caf46a0 Use one fsevent_watch process per listener instead of one per dir
• 0cb1597 Bump RuboCop TargetRubyVersion to supported minimum.
• f1ed743 Remove unsupported check.
• e844336 Merge pull request #469 from nilbus/mutagen
• bae2631 Remove unnecessary encoding doc string; UTF-8 is default
• 7f65697 Add spec examples covering real mutagen filenames
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #351.