Bump mail from 2.5.4 to 2.7.1 in /example

[dependabot]

Bumps mail from 2.5.4 to 2.7.1.

Changelog

Sourced from mail's changelog.

== Version 2.7.1 (unreleased)

Compatibility:

• Restore LF=>CRLF conversions for properly encoded non-binary emails. (rubys)
• Gracefully parse certain invalid Content-Type headers. (rafbm)
• Support x-uue transfer encoding as uuencoding. (jkraemer)

Features:

• Expose Mail::Field#unparsed_value to read the raw field value, before parsing. (Tensho)

Performance:

• Speed up message encoding, especially with large attachments. (dalibor)

Bugs:

• Fix transfer encoding when message encoding is blank. (jakubonty, saks)
• Fix 7bit/base64 content transfer encoding mismatch. (ahorek)
• Fix UTF-8 attachment filename quoting. (ahorek)
• Fix delete_all using a readonly IMAP connection. (kimromi)

== Version 2.7.0 (2017-10-31)

Security:

• #1097 – SMTP security: prevent command injection via To/From addresses. (jeremy)

Features:

• #647 – IMAP: specify IMAP server search charset with Mail.find(search_charset: 'UTF-8'). (yalab)
• #650 - UTF-7 charset support. (johngrimes)
• #664 - RSpec: with_html and with_text matchers. (zakkie)
• #723 – IMAP: support enable_starttls: true for TLS upgrade on non-IMAPS/SSL servers. (doits)
• #804 - Configurable SMTP open_timeout and read_timeout. (ankane)
• #853 - Mail::Message#set_sort_order overrides the default message part sort order. (rafbm)
• #856 - Added :logger delivery method. (zacholauson)
• #900 - Support non-instance_eval builder API. Yield self to Mail.new if the provided block takes any arguments. (taavo)
• #1065 - Require STARTTLS using :enable_starttls. (bk2204)
• #1002 - Transcoding replaces invalid chars with "�" instead of discarding them. (kjg)
• #1053 - Ruby 2.4.0 compatibility. Fixnum+Bignum unified as Integer. (peterkovacs)
• #1094 - Core extensions removal: Drop String#at, from, last and is_utf8? since they are no longer used by Mail internals. (metcalf)
• #1095 - Core extensions removal: Drop String#mb_chars, not_ascii_only?, constantize, first, to to avoid monkey patching the standard library. (metcalf)
• #1111 - Mail::Field.parse API which deprecates calling Mail::Field.new with unparsed header fields. (jeremy)
• #1117 - Configurable POP3 read_timeout. (hspazio)

Performance:

• #1059 - Switch from mime-types to mini_mime for a much smaller memory footprint. (SamSaffron)
• #1119 - Speed up large attachment encoding by memoizing slow ASCII-only checks. (dalibor)

Compatibility:

• #464 - Improve attachment filename detection by preferring Content-Disposition filename. (lawrencepit)
• #535 - IMAP: fetch messages WITH IMAP FLAGS by passing a block with four args. (lawrencepit)
• #558 - Parser: cope with unknown charsets in header fields by falling back to ASCII. (boesemar)

... (truncated)

Commits

• 7c43c84 2.7.1 release
• 870fc4f additionally register UnixToUnix encoding as 'x-uue'
• 19592c0 IMAP: fix delete_all against a readonly connection
• 1a8a477 Format generated ruby files by ragel using rufo gem
• 3f35b37 Set full path of the ragel source file to rake task
• 20482ae Perform gem install bundler to address `LoadError: cannot load such
• dead487 Fix 7bit/base64 content transfer encoding mismatch
• 58f3bbf 2.7.1.rc1 release candidate
• 6a019d5 Restore LF line ending parsing
• 93e811c Fix quote_token with frozen AS::Multibyte chars
• Additional commits viewable in compare view

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