Fix README link for MongoDB java driver API

[codecov[bot]]

Codecov Report

Merging #339 (0104d1a) into master (2edee31) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #339   +/-   ##
=========================================
  Coverage     57.57%   57.57%           
  Complexity      750      750           
=========================================
  Files           131      131           
  Lines          5471     5471           
  Branches        510      510           
=========================================
  Hits           3150     3150           
  Misses         2091     2091           
  Partials        230      230           

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[zigzago]

Thank you