Replace opencollective dependency with opencollective-postinstall

[leipert]

The opencollective dependency brings in a lot of unneeded packages into the dependency tree for essentially console.log at post install. On a fresh project, where we just habe bootstrap-vue as a dependency, it pulls in over 100 dependencies. The open collective project has an alternative dependency which does essentially the same thing without polluting the dependency tree: opencollective-postinstall

Output before:

Output after:

Dependency tree before/after:

# before
yarn list | wc -l
# yields 111

#after
yarn list | wc -l
# yields 15

[codecov]

Codecov Report

Merging #2067 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #2067   +/-   ##
=======================================
  Coverage   61.27%   61.27%           
=======================================
  Files         154      154           
  Lines        2887     2887           
  Branches      796      796           
=======================================
  Hits         1769     1769           
  Misses        802      802           
  Partials      316      316

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