Update UPGRADING with python requirements.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@39892 a592a061-630c-0410-9148-cb99ea01b6c8
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Julien Rioux 2011-10-19 22:26:23 +00:00
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commit 7bc0f381d9

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How do I upgrade my existing LyX system to version 2.0.x?
How do I upgrade my existing LyX system to version 2.1.x?
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* Upgrading from LyX 2.0.x:
Python version >=2.4 is now required.
Python version >3.0 is still not yet supported.
* Upgrading from LyX 1.6.x:
The format of preference and session files has changed. LyX 2.0.x is