Gatling guess version fix for Gatling 3.10+

[letsrokk]

Fixing incorrect guessed version when using Gatling 3.10.x

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Each PR must conform to Developer's Guide.

Quick checklist:

• Description of PR explains the context of change
• Unit tests cover the change, no broken tests
• No static analysis warnings (Codacy etc.)
• Documentation update ('available in the unstable snapshot' warning if necessary)
• Changes file inside site/dat/docs/changes directory, one-line note of change inside

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.75%. Comparing base (65653ed) to head (726c0f8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1839      +/-   ##
==========================================
+ Coverage   89.75%   89.75%   +0.01%     
==========================================
  Files          71       71              
  Lines       19542    19544       +2     
==========================================
+ Hits        17538    17540       +2     
  Misses       2004     2004              

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