message: installation guide should clarify that driver's boost dependency is header-only
diff: @@ -13,7 +13,7 @@ title = "Installing the mongocxx driver"
  - Any standard Unix platform, or Windows 7 SP1+
  - A compiler that suports C++11 (gcc, clang, or Visual Studio)
  - CMake 3.2 or later
  -- boost (optional)
  +- boost headers (optional)
  We currently test the driver with the following configurations:
  