example(jest-puppeteer): fix package .json

[acravenho]

While adding Jest and Puppeteer to my project I noticed that the example package.json file contained a small bug which would causing the following error:

[FATAL] No build files found, please run `nuxt build` before launching `nuxt start`

The simple fix was to add another & sign between nuxt build and nuxt start

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

The change would fix the jest-puppeteer example folder for any future users who may want to use this as an example.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-io]

Codecov Report

Merging #4997 into dev will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #4997      +/-   ##
==========================================
- Coverage   92.27%   92.23%   -0.05%     
==========================================
  Files          74       74              
  Lines        2472     2472              
  Branches      608      608              
==========================================
- Hits         2281     2280       -1     
- Misses        171      172       +1     
  Partials       20       20

Impacted Files	Coverage Δ
packages/vue-renderer/src/renderer.js	94.81% <0%> (-0.52%)	⬇️

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[manniL]

Thank you ☺️