Update to swift 4

[AYastrebov]

• update to swift 4
• carthage support for swift 4

[AliSoftware]

Hey @AYastrebov thanks for this PR, looks good to me 👌

Could you just add an entry in the CHANGELOG.md (under the "# Master" entry) to credit yourself?

(Just format them the same as the previous entries — just don't forget to add two spaces at the end of the line after the ending period . , for Markdown formatting to render as intended)

[AliSoftware]

• Could you also update the README.md?

  • change the "Requirements" section to add Swift 4 to supported versions
  • edit the shields.io' Badge used just above that # Requirements title, to change it to something like [![Language: Swift 3 & 4](https://img.shields.io/badge/Swift-3%20%26%204-orange.svg)](https://swift.org):

• Also please add an entry to the CHANGELOG.md to credit yourself 👍

Thanks!

[AYastrebov]

@AliSoftware sure, will make it asap

[AYastrebov]

I've updated the PR. Also pushed a new tag 4.0.2 and updated podSpec.

[AliSoftware]

Cool thanks, I'll try to merge & do a release in the afternoon 👍

[AliSoftware]

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 🚀  Reusable (4.0.2) successfully published
 📅  March 15th, 16:13
 🌎  https://cocoapods.org/pods/Reusable
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