Crystal 0.35.0 Support

Dependency Upgrades

• https://github.com/crystal-ameba/ameba/releases/tag/v0.13.0

Fixes

• Fix now invalid variable name
  • in is now a reserved variable name
• Fix format list within help info
  • Now properly lists the formats Format of the input data. Supported formats: json, yaml, xml versus Format of the input data. Supported formats: OQ::Format

Changes

• Some updates related to 0.35.0
  • Use exhaustive case for OQ::Format.converter method
  • Remove --link-flags option when building as libxml2 is now properly linked