Upgrade rollup plugins

[vladimyr]

This PR swaps deprecated plugins with new official variants:

1. rollup-plugin-buble => @rolllup/plugin-buble
2. rollup-plugin-json => @rollup/plugin-json

This is stacked onto #259

[codecov]

Codecov Report

Merging #263 into master will increase coverage by 0.4%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master    #263     +/-   ##
========================================
+ Coverage      75%   75.4%   +0.4%     
========================================
  Files          11      12      +1     
  Lines         420     427      +7     
  Branches      158     156      -2     
========================================
+ Hits          315     322      +7     
  Misses        100     100             
  Partials        5       5

Impacted Files	Coverage Δ
src/index.ts	71.84% <100%> (+0.2%)	⬆️
src/utils/normalize-plugin-name.ts	100% <100%> (ø)

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[vladimyr]

@fi3ework Hm, care to share why did you close it?

[fi3ework]

@vladimyr Hi, this PR bumps @rolllup/plugin-buble and @rollup/plugin-json. These two plugins had been upgraded in #357. And #259 is still opened.

[vladimyr]

Ah missed that bit, thanks for the explanation 👍, hopefully, #259 lands soon.

[fi3ework]

@vladimyr My bad, I should close it with leaving a reason 😅.

[vladimyr]

Kill it with fire if you like 😛 I was just interested in giving some love to this awesome project which is by far the best rollup wrapper out there. Seeing someone else, actually, the man himself did it still warms my heart 😉