Improve "Selenium2Driver::applyTimeouts" error handling for Selenium 3 support

[aik099]

Closes https://github.com/minkphp/MinkSelenium2Driver/issues/379

Added code remains uncovered by tests because we're testing on Selenium 2 only.

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4ca4083) 90.19% compared to head (2fe6b36) 89.80%.

Files	Patch %	Lines
src/Selenium2Driver.php	50.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #380      +/-   ##
============================================
- Coverage     90.19%   89.80%   -0.39%     
- Complexity      168      169       +1     
============================================
  Files             1        1              
  Lines           469      471       +2     
============================================
  Hits            423      423              
- Misses           46       48       +2     

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[aik099]

Thank you @stof . Merging.