Update README.md

王权利请求将github/fork/spuder/patch-3合并到master

Created by: spuder

Edits README.md to clarify that git 1.7.10 is required Master branch

Partially resolves Issue #5090 (closed)

It would be ideal if the instructions linked to 'how' to update to 1.7.10.

合并请求报告