build: publish dist folder to npm

[mattlewis92]

This changes lerna so that only the dist folder gets published to npm and means that the package will just work with ivy.

Relevant issues https://github.com/valor-software/ng2-dragula/issues/951

Before submitting

N/A

[codecov[bot]]

Codecov Report

Merging #962 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #962   +/-   ##
=====================================
  Coverage      84%    84%           
=====================================
  Files           8      8           
  Lines         300    300           
  Branches       38     38           
=====================================
  Hits          252    252           
  Misses         31     31           
  Partials       17     17

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[vladimiry]

Is something blocking the PR?

[daniloff200]

looks like such changes were merged already to dev