Wrong project version in CMakeLists.txt for tag 4.8

[OpenJowel]

The project version stipulated on line 3 of CMakeLists.txt for the tag 4.8 still mentions 4.7.0
This leads to inconsistencies when trying to automate packaging when using commands such as
git describe --long --tags | sed -r 's/([^-]*-g)/r\1/;s/-/./g'
and with the outputed binary names