Message in new tests, php version to 7.1

Fixed %k example

Update readme

Fixed some formats

Merge branch 'master' of https://github.com/alphp/strftime

Catch DateTime Exception

Update version to 0.0.6

Version 0.0.5

Version 0.0.4

Update version to 0.0.3