Release 0.1.5

[cowboyd]

Motivation

• migrate from Deno.test to BDD https://deno.com/blog/v1.21#bdd-style-testing
• fix bug where continuations were not re-raising the same error when invoked
  multiple times 🐛 oneshot continuation should throw the same error consistently #9
• add a .tail() method to both resolve and reject continuations that will
  re-use the currently executing reduction loop rather than calling reduce
  recursively and adding another JS call frame to the stack.
  prevent stack overflows with k.tail() #11