[RFC] README: Update Linux version requirement to 2.3.31.

[Akihiro Sagawa]

I've not tested the version, but recent commit 45a632ee81c9c5c58309426de5aadbd8dbbba0f5
introduces SYS_mmap2 system call which doesn't exist before 2.3.31.
So, should we update the requirement? Is 2.3.31 valid enough?

Signed-off-by: Akihiro Sagawa <sagawa.aki at gmail.com>
---
 README                     | 2 +-
 documentation/README.de    | 2 +-
 documentation/README.es    | 2 +-
 documentation/README.fi    | 2 +-
 documentation/README.fr    | 2 +-
 documentation/README.hu    | 2 +-
 documentation/README.it    | 2 +-
 documentation/README.ja    | 2 +-
 documentation/README.ko    | 2 +-
 documentation/README.no    | 2 +-
 documentation/README.pt    | 2 +-
 documentation/README.pt_br | 2 +-
 documentation/README.ru    | 2 +-
 documentation/README.sv    | 2 +-
 documentation/README.tr    | 2 +-
 documentation/README.uk    | 2 +-
 documentation/README.zh_cn | 2 +-
 17 files changed, 17 insertions(+), 17 deletions(-)

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