v6.1.0

What's Changed

• Added Str::trim, Str::ltrim and Str::rtrim methods by @andrey-helldar in #243
• Actualize Arr::of() methods by @andrey-helldar in #244
• Actualize Str::of() methods by @andrey-helldar in #245
• Fixed bug with checking instance heirs by @andrey-helldar in #246

Full Changelog: v6.0.1...v6.1.0