Release 2.4.0

These release notes were written for the git hash 7b2e609.

Fixed

• Fixed incorrect Help Name in #1202 via @fxrlv
• Fixed a bug where Context.Value did not look across all fileSets when looking for a named flag in #1210 via @jcgregorio
• Fixed an issue with flags being set by parent context's (IntSlice, Int64Slice) in #1214 via @anicoll
• Fixed a bug where App.Reader was not correctly propagated to the subcommands in #1225 via @Coderlane
• Fixed example code input arguments in #1226 via @Coderlane
• Fixed a bug where default value would changed when parsing slice flags in #1236 via @vipally
• Fixed a bug where slice flag values don't append default values from ENV or a file in #1239 via @vipally
• Fixed indentation on help text in #1279 via @rliebz
• Fixed a Go 1.17 compatibility issue for a test case in #1277 via @GlenPickle
• Fixed a nil pointer panic when getting cli/context flagSet in UsageError function in #1327 via @WUST-mengqinyu
• Fix strconv.ParseFloat usage in #1335 via @kolyshkin
• Improve handling of file flags in #1336 via @kolyshkin

Changed

• Improve help text for Slice flags in #1208 via @Madhur1997
• Update GitHub actions in #1212 via @jcgregorio
• Fix typo in documentation in #1216 via @wgumenyuk
• Improve Man Page in #1227 via @bobuhiro11
• Remove duplicate comment in #1232 via @corburn
• Improve how UsageText appears when viewing help from subcommands in #1255 via @cpacifying
• Remove reflect calls for Hidden flags feature in #1258 via @dearchap
• Refactor and Cleanup context in #1264 via @dearchap
• Fix grammatical error in documentation in #1281 via @imaskm
• Improve documentation in #1304 via @JayCeeJr
• Improve Man Page in #1311 via @jolheiser
• Improve migration documentation in #1317 via @tlimoncelli
• Improve migration documentation in #1319 via @mritunjaysharma394
• Fixed assertion function in test cases in #1320 via @anthonyfok
• Update markdown library dependency in #3121 via @anthonyfok
• Update yaml library dependency in #1326 via @mildaniel
• Remove useless variable declaration in #1330 via @chenxiao-zhao
• Improve migration documentation in #1340 via @infraredgirl

Added

• Added support for Go 1.15 in #1200 via @asahasrabuddhe
• Add link to pkg.go.dev in manual.md in #1207 via @bbkane
• Add link to GoDoc for v2 in #1228 via @zwass
• Add Destination field to the TimeStamp flag in #1251 via @davidsbond
• Add support for Go 1.16 in #1270 via @rliebz
• Add description and usage text in generated documentation in #1287 via @subpop
• Add support for Go 1.17 in #1323 via @rliebz