* Fixes vs crystal head
* Use crystal nightly
* Remove trailing ? from local variable
* Do not use ? in the lhs
ref https://github.com/crystal-lang/crystal/issues/6685#issuecomment-419758587
* Upgrade to crystal 0.29.0 (warnings free) (#108)
* Remove trailing ? from local variable (take 2)
* Fix Time.now deprecation warnings
* Remove Crystal nightly