Add ability to choose between stable & unstable versions when specify exact version of Xcode

What's Changed

• Get stable versions as default by @einar-notland in #31
• Bump tmpl from 1.0.4 to 1.0.5 by @dependabot in #29
• Bump ansi-regex from 5.0.0 to 5.0.1 by @dependabot in #33
• Improve available versions output if version is not found by @maxim-lobanov in #34

Full Changelog: v1.3.0...v1.4.0