Use appropriate class name for docker

[junoyoon]

Docker runtime class name is wrongly named as "Sequence".
It should be "Docker".

[codecov-io]

Codecov Report

Merging #89 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master     #89   +/-   ##
======================================
  Coverage    83.9%   83.9%           
======================================
  Files          40      40           
  Lines        1373    1373           
  Branches      276     276           
======================================
  Hits         1152    1152           
  Misses        221     221

Impacted Files	Coverage Δ
compile/functions/runtimes/docker.js	100% <100%> (ø)	⬆️

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[junoyoon]

@jthomas

[jthomas]

Thanks for spotting and fixing this.