Add a missing type in CoreDriver

[stof]

Adding the same type than in DriverInterface allows drivers to add it.

[codecov[bot]]

Codecov Report

Merging #857 (0301360) into master (9ea43c2) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #857   +/-   ##
=========================================
  Coverage     98.72%   98.72%           
  Complexity      374      374           
=========================================
  Files            24       24           
  Lines          1022     1022           
=========================================
  Hits           1009     1009           
  Misses           13       13           

Impacted Files	Coverage Δ
src/Driver/CoreDriver.php	100.00% <100.00%> (ø)

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