fix(docs): mistake ws usage

[electroluxcode]

hi, it seem no work when i try run code as docs
then i clone this respository，and found that it may be a mistake about docs

[coveralls]

coverage: 97.445%. remained the same
when pulling 234e94a on electroluxcode:docs/usage-ws
into d5ac85e on share:master.

[alecgibson]

Thanks for the contribution!