Bump to v5.2.0

Bump to v5.1.0

Organizing release notes

Also build on 4.x

Updated release notes

Linking release notes from main page.

Fixed bug where scale was ignored for OffsetCenterOfMassShape (jrouwe…

…#509)

Updated API changes

ARM 32-bit support for Windows (will probably work on Linux/Android t…

…oo) (jrouwe#332)

Setting released version