message: Update installation.md
  Added missing cmake target for Windows.
diff: @@ -182,7 +182,7 @@ and boost is in `c:\local\boost_1_59_0`:
  'C:\Program Files (x86)\CMake\bin\cmake.exe' -G "Visual Studio 14 Win64"
  -DCMAKE_INSTALL_PREFIX=C:\mongo-cxx-driver
  -DCMAKE_PREFIX_PATH=c:\mongo-c-driver
  - -DBOOST_ROOT=c:\local\boost_1_59_0
  + -DBOOST_ROOT=c:\local\boost_1_59_0 ..
  ```
  `mongocxx` builds shared libraries by default. This is the recommended
  