Adjust bug template to mention REPL.it

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Description

This will adjust the BUG issue template in two ways:

• It mentions the REPL.it template used by the plugins repo as it is also valuable for Rollup core as it allows all options to be used
• It requires a "reproduction link" as I believe ALL reproductions should be possible to be provided as some link. Would like to experiment how users react to that and if it improves provided reproductions.

Opinions?

[codecov]

Codecov Report

Merging #3371 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3371   +/-   ##
=======================================
  Coverage   93.27%   93.27%           
=======================================
  Files         172      172           
  Lines        6082     6082           
  Branches     1812     1812           
=======================================
  Hits         5673     5673           
  Misses        218      218           
  Partials      191      191

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[lukastaegert]

I think I want to hold of merging this for now as I am not entirely happy about the REPL.it template. As it turns out, it will not automatically pick up generated files unless you have already added files with the same name, which is not good for code-splitting issues. I think I want to use an adjusted template that bundles to stdout instead and also contains some comments explaining this. @shellscape since it appears you control the @rollup username for repl.it, would you be able to make a template of mine "official" once I am happy with it?

[lukastaegert]

@shellscape Could you fork this REPL into @rollup: https://repl.it/@lukastaegert/rollup-repro ?

[shellscape]

Done! https://repl.it/@rollup/rollup-repro