message: Update docs to reflect boost tested against
diff: @@ -20,7 +20,7 @@ We currently test the driver with the following configurations:
  clang | 3.8 | 7.0 (Apple) | -
  gcc | 4.8, 5.4 | - | -
  VS | n/a | n/a | 14 (2015) Update 3
  - boost | - | 1.5.3 | 1.6.0
  + boost | - | 1.67.0 | 1.60.0
  Versions older the the ones listed may not work and are not
  supported; use them at your own risk.
  