v0.6.5

This is the first Tokay version supporting and established on generics.

What's Changed

• Context-based stacks by @phorward in #114
• Alternative builtin registry toolchain by @phorward in #112
• Redefine severity by @phorward in #119
• Establishing generic parselets and functions by @phorward in #105
• Implement Keyword<P>-parselet prelude by @phorward in #125

Full Changelog: v0.6.4...v0.6.5