feat: generated files log

[kimulaco]

resolve: #73

I added the log of the generated file with reference to the @nuxtjs/sitemap.
And I added a generate command to package.json to check the log.

Please merge if you like

[codecov]

Codecov Report

Merging #74 into master will not change coverage by %.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #74   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           49        52    +3     
  Branches         7         8    +1     
=========================================
+ Hits            49        52    +3     

Impacted Files	Coverage Δ
lib/module.js	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f40dcd8...967d44d. Read the comment docs.

[manniL]

Thanks a lot for the PR and the idea 🙏

[kimulaco]

@manniL Thank you for merging!
Do you have a plan when will this update be published to npm?