v0.1.3

Fixed

• Fixed support for nested HTTP callouts.
  Thanks @SvetlinZarev!

Changed

• Changed wee-alloc to an optional feature.
  Thanks @yuval-k!

Added

• Added support for building for wasm32-wasi target.
• Added support for metrics.
• Added support for RootContext to create child contexts for streams.
  Thanks @dgn!
• Added support for setting network buffers.