Stricter typescript type for Trans components prop

[danreeves]

Since the values in the components prop are being passed to cloneElement only the ReactElement type is really supported. All other types accepted by ReactNode will cause a runtime error. You can test this by checking out the first two commits in this branch.

• d8904f7: Types pass but as the unit test shows react throws
• 563966b: Corrected types: tslint now fails
• 516fbdc & 9509d54: I removed the example typescript error and tests for invalid behaviour

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included

Checklist (for documentation change)

• only relevant documentation part is changed (make a diff before you submit the PR)
• motivation/reason is provided

[coveralls]

Coverage remained the same at 95.951% when pulling 9509d54 on danreeves:fix-trans-components-types into b2dcdfa on i18next:master.

[pedrodurek]

Looks great to me, thanks @danreeves

[adrai]

thank you, released in v11.17.1