fix: options are optional

[vasco-santos]

Options for decode and encode are optional. This creates typescript errors in libp2p unless we provide options

cc @alanshaw

[codecov]

Codecov Report

Merging #16 (7ce1113) into master (2005238) will not change coverage.
The diff coverage is n/a.

❗ Current head 7ce1113 differs from pull request most recent head 2643b01. Consider uploading reports for the commit 2643b01 to get more accurate results

@@           Coverage Diff           @@
##           master      #16   +/-   ##
=======================================
  Coverage   97.69%   97.69%           
=======================================
  Files           7        7           
  Lines         130      130           
=======================================
  Hits          127      127           
  Misses          3        3           

Impacted Files	Coverage Δ
src/decode.js	95.65% <ø> (ø)
src/encode.js	100.00% <ø> (ø)

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[vasco-santos]

@alanshaw can you please release this when you have a moment? 🙏🏼