Add types for method parameters

[stof]

Now that the Mink DriverInterface has parameter types (thanks to https://github.com/minkphp/Mink/pull/856), we can add them in the child class.

[codecov[bot]]

Codecov Report

Merging #371 (374413c) into master (037675d) will increase coverage by 0.95%. The diff coverage is 97.77%.

@@             Coverage Diff              @@
##             master     #371      +/-   ##
============================================
+ Coverage     89.02%   89.97%   +0.95%     
+ Complexity      315      168     -147     
============================================
  Files             2        1       -1     
  Lines           875      469     -406     
============================================
- Hits            779      422     -357     
+ Misses           96       47      -49     

Impacted Files	Coverage Δ
src/Selenium2Driver.php	89.97% <97.77%> (+0.74%)	:arrow_up:

... and 1 file with indirect coverage changes

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