Conditional loading

[jimmywarting]

best way to conditionally load libraries without the use of top level await (that requires node 14) was to use cjs

still works to import it totally fine in deno and browser without bundling

[codecov]

Codecov Report

Merging #104 (b111425) into master (701103f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #104   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         4    +1     
  Lines          397       401    +4     
  Branches        58        59    +1     
=========================================
+ Hits           397       401    +4     

Impacted Files	Coverage Δ
index.js	100.00% <100.00%> (ø)
streams.cjs	100.00% <100.00%> (ø)

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