Update unicode-emoji requirement from ~> 3.1 to >= 3.1, < 5.0

[dependabot]

Updates the requirements on unicode-emoji to permit the latest version.

Changelog

Sourced from unicode-emoji's changelog.

4.0.0

• Breaking change: Regexes now include single skin tone modifiers (🏻) and hair components (🦰). They were previously considered to be invalid partial Emoji, however since they are supposed to be displayed as Emoji in isolation, they are now part of the regexes (see ED-20 in UTS51).
• Breaking change: Drop REGEX_ANY in favor of REGEX_PROP_EMOJI
• Expose regexes for Emoji props (REGEX_PROP_*). The advantage over using the native regex properties directly is that you will be able to use the Emoji support level of this gem instead of Ruby's. For example, as of releasing this, the current Emoji version is 16.0, while Ruby is at 15.0. Also see README for a table listing the regexes that match Emoji properties.
• Add REGEX_EMOJI_KEYCAP for matching specifically Emoji keycaps
• Use character class instead of lookbehind for native text emoji and non-emoji pictographic regexes

3.8.0

• Add new RGI-based regexes REGEX_INCLUDE_MQE and REGEX_INCLUDE_MQE_UQE which allows to match for minimally-qualified and unqualified RGI sequences (Emoji that lack some VS16)
• Add specs running through emoji-text.txt and classify qualification statuses per regex
• Improve documentation and add detailed table about which regex has which features
• Native regexes: Use native Emoji props for Emoji text presentation
• Update CLDR to v46 (valid subdivisions)
• Further improvements (see commit log)

3.7.0

• Bump required Ruby slightly to 2.5
• Introduce new REGEX_POSSIBLE which contains the regex described in https://www.unicode.org/reports/tr51/#EBNF_and_Regex
• Fix that some valid subdivisions were not decompressed (REGEX_VALID)
• Be stricter about selection of tag characters in REGEX_WELL_FORMED
  • Only U+E0030..U+E0039, U+E0061..U+E007A allowed
  • Max tag sequence length
• Use native /\p{RI}/ regex for regional indicators
• Separately autoload emoji list, so it can be loaded when other indexes are not needed

3.6.0

• Unicode::Emoji::REGEX_TEXT now matches non-emoji keycaps like "3⃣" (U+0033 U+20E3)
• Minor refactorings

3.5.0

• Emoji 16.0

3.4.0

• Emoji 15.1

3.3.2

... (truncated)

Commits

• dcfe469 Release v4.0.0
• 1afedf2 Move visual components
• b7feb94 Breaking: Remove REGEX_ANY
• 64daa74 Add REGEX_EMOJI_KEYCAP
• 6ed7c5a Breaking: Include skin tone modifiers and hair components in regexes
• edc3435 Use character class instead of lookbehind for native text emoji and non-emoji...
• 0ddb7f6 Expose Emoji properties as regexes
• b86a3cf Release v3.8.0
• adae6c0 Add link to MQE / UQE list
• c25f980 Update CLDR to v46
• Additional commits viewable in compare view

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