3.8.0

Complete commits list: 3.7.0...3.8.0

Summary:

• Accept Unit enum in startOf and endOf by @kylekatarnls in #3052
• Add test for German period translation by @kylekatarnls in #3054
• Add tests for CarbonInterval and CarbonPeriod by @kylekatarnls in #3055
• Add generic methods isStartOfUnit and isEndOfUnit by @kylekatarnls in #3053
• Implement isStartOf* and isEndOf* for all units by @kylekatarnls in #3056
• Update Spanish translations by @DannyJJK in #3060
• Optimize getIntervalDayDiff by @kylekatarnls in #3061
• Optimize diffInDays by @kylekatarnls in #3062
• Use arrow functions to getIsoUnits by @kylekatarnls in #3064
• Simplify PHPStan extension by @ondrejmirtes in #3065

New Contributors

• @DannyJJK made their first contribution in #3060