Update README.md

Add no longer maintained message

Author: adamlwgriffiths

README.md

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+Whilest this project is still usable, it is no longer maintained.
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+I will accept pull-requests and patches, but my own major development on this library has ceased.
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+The lessons learnt while developing and using this are being used in the next-generation OpenGL framework [OMGL](https://github.com/adamlwgriffiths/OMGL), which will be used as a base for the [Bast 3D Engine](https://github.com/adamlwgriffiths/bast).
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+
 PyGLy
 =====================