Demo: coverage report comment for the go-coverage-report README

[fgrosse]

Demo pull request to show the new coverage report comment of fgrosse/go-coverage-report#110 for the README screenshot. Not meant to be merged.

It changes the coverage in two packages: the new Clone methods are untested (decrease in prioqueue) and new tests cover topk.Largest (increase in topk).

[github-actions]

Merging this branch changes the coverage (1 decrease, 1 increase)

Impacted Packages	Coverage Δ	🤖
github.com/fgrosse/prioqueue	92.59% (-7.41%)	👎
github.com/fgrosse/prioqueue/topk	100.00% (+54.17%)	🌟

Coverage details

_{Compared to base commit 067c0f9 (run #36055790830)}

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/fgrosse/prioqueue/max_heap.go	92.59% (-7.41%)	54 (+4)	50	4 (+4)	👎
github.com/fgrosse/prioqueue/min_heap.go	92.59% (-7.41%)	54 (+4)	50	4 (+4)	👎
github.com/fgrosse/prioqueue/topk/topk.go	100.00% (+54.17%)	24	24 (+13)	0 (-13)	🌟

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files:

• github.com/fgrosse/prioqueue/topk/topk_test.go