Bump paperclip from 3.4.2 to 3.5.4

[dependabot-preview]

Bumps paperclip from 3.4.2 to 3.5.4.

Changelog

Sourced from paperclip's changelog.

New in 3.5.4:

Bug Fix: Users were reporting IOErrors. Stop closing extra files to prevent.

New in 3.5.3:

Improvement: After three long, hard years... we know how to upgrade
Bug Fix: #expiring_url returns 'missing' urls if nothing is attached
Improvement: Lots of documentation fixes
Improvement: Lots of fixes for Ruby warnings
Improvement: Test the most appropriate Ruby/Rails comobinations on Travis
Improvement: Delegate more IO methods through IOAdapters
Improvement: Remove Rails 4 deprecations
Improvement: Both S3's and Fog's #expiring_url can take a Time or Int
Bug Fix: Both S3's and Fog's expiring_url respect style when missing the file
Bug Fix: Timefiles will have a reasonable-length name. They're all MD5 hashes now
Bug Fix: Don't delete files off S3 when reprocessing due to AWS inconsistencies
Bug Fix: "swallow_stream" isn't thread dafe. Use :swallow_stderr
Improvement: Regexps use \A and \Z instead of ^ and $
Improvement: :s3_credentials can take a lambda as an argument
Improvement: Search up the class heirarchy for attachments
Improvement: deep_merge options instead of regular merge
Bug Fix: Prevent file deletion on transaction rollback
Test Improvement: Ensure more files are properly closed during tests
Test Bug Fix: Return the gemfile's syntax to normal

New in 3.5.2:

• Security: Force cocaine to at least 0.5.3 to include a security fix
• Improvement: Fixed some README exmaples
• Feature: Added HTTP URL Proxy Adapter, can assign string URLs as attachments
• Improvement: Put validation errors on the base attribute and the sub-attribute

New in 3.5.1:

• Bug Fix: Returned the class-level attachment_definitions method for compatability.
• Improvement: Ensured compatability with Rails 4
• Improvement: Added Rails 4 to the Appraisals
• Bug Fix: #1296, where validations were generating errors
• Improvement: Specify MIT license in the gemspec

New in 3.5.0:

• Feature: Handle Base64-encoded data URIs as uploads
• Feature: Add a FilenameCleaner class to allow custom filename sanitation
• Improvement: Satisfied Mocha deprecation warnings
• Bug Fix: Allow empty string to be submitted and ignored, as some forms do this
• Improvement: Make #expiring_url behavior consistent with #url
• Bug Fix: "Validate" attachments without invoking AR's validations
• Improvement: Various refactorings for a cleaner codebase

... (truncated)

Commits

• aaee258 v3.5.4
• fb5071a Remove a file.close: users reporting problems
• 5ecd1d3 Updated appraisal files and News for 3.5.3
• f6f5ea1 After three long, hard years... we know how to upgrade
• eb75c08 #expiring_url returns 'missing' urls if nothing is attached
• eeddf29 Merge pull request #1410 from smallspark/doco-updates
• 6b4c254 Add documentation for preserve_files option
• f2c670e Merge pull request #1409 from fxn/patch-1
• 51609d6 fixes indentation in code example
• 6a6f855 Delegate binmode and binmode? in AbstractAdapter
• Additional commits viewable in compare view

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