Bumped version number to 4.3.2

Bumped version number to 4.2.6

Added instructions to build and install kangaru with cmake presets

Using RelWithDebInfo when building and testing appveyor

Bump version number

Merge branch 'dev-4.2.x'

Removed old ppa for clang 5 and up

Removed old ppa for clang 5 and up

Merge pull request #95 from gracicot/dev-4.2.x

Added missing include

Update README.md