Update README.md

Forgot to disable RDP in the AppVeyor configuration.

Bumping version to 2.0.5.

Changes:

- Fixed inconsistencies in scalar_traits usage that yielded incorrect results for mixed integer/floating-point calculations.

- Added cml::epsilon<>, and changed most defaulted tolerance arguments to use it.

Tagging CML 2.0.1, with preliminary VC++2015 support.

Merge pull request #1 from RobJinman/RobJinman-patch-1

Added missing slash to header installation path

Updated copyright text.