cmake: Bump version to 0.3.1
cmake: Bump version to 0.3.1

Bump soversion 2.0.0 -> 2.1.0.

Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

evelikov/waffle,maurossi/waffle,dcbaker/waffle,yinquan529/waffle-gl-waffle,chadversary/waffle,chadversary/waffle,janesma/waffle,waffle-gl/waffle,evelikov/waffle,waffle-gl/waffle,chadversary/waffle,maurossi/waffle,waffle-gl/waffle,fjhenigman/waffle,dcbaker/waffle,fjhenigman/waffle,fjhenigman/waffle,janesma/waffle,yinquan529/waffle-gl-waffle,yinquan529/waffle-gl-waffle,evelikov/waffle,janesma/waffle,waffle-gl/waffle,dcbaker/waffle,maurossi/waffle