Mention maven-failsafe-plugin version to be considered in User Guide

[dpolivaev]

Overview

It took me some hours to understand why my integration tests run with JUnit4 provider although I configured maven surefire plugin as described in the guide. It turned out that I had to update maven-failsafe plugin version too. My pull request to the documentation reflects my learnings.

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Definition of Done

• All continuous integration builds pass

[codecov]

Codecov Report

Merging #1764 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1764      +/-   ##
============================================
- Coverage     91.72%   91.71%   -0.02%     
  Complexity     4103     4103              
============================================
  Files           350      350              
  Lines          9714     9714              
  Branches        779      779              
============================================
- Hits           8910     8909       -1     
  Misses          616      616              
- Partials        188      189       +1

Impacted Files	Coverage Δ	Complexity Δ
...jupiter/engine/execution/ExtensionValuesStore.java	89.7% <0%> (-1.48%)	21% <0%> (ø)

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[sbrannen]

This has been merged into master

Thanks!

[sbrannen]

Further refined in commit d26f14f