Main CMakeLists.txt contains package version of 3.0.2 and not 5.2.0 (in that release) or above in git master

Main CMakeLists.txt contains package version of 3.0.2 and not 5.2.0 (in that release) or above in git master.

```
project(BCunit C)

set(PACKAGE "BCUnit")
set(PACKAGE_NAME "${PACKAGE}")
set(PROJECT_VERSION_MAJOR 3)
set(PROJECT_VERSION_MINOR 0)
set(PROJECT_VERSION_PATCH 2)
```