[OpenSCAD] minor README fix

[chrysn]

hi openscad developers,

as of commit 80e526880a, openscad depends on libeigen >= 2.0.13 due to
the addition of #include <Eigen/Dense>. (changelog for 2.0.13 says:
"Actually install the Eigen/Eigen and Eigen/Dense public headers").
README still claims it's 2.0.11.

just a minor issue, but might confuse ubuntu lucid users who still use
2.0.12.

regards
chrysn

-- 
To use raw power is to make yourself infinitely vulnerable to greater powers.
  -- Bene Gesserit axiom
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