Add syntax highlighting to README.
Add syntax highlighting to README.

Sorry, forgot to amend this to the previous commit.

Change-Id: Iaf1758fb4d7dbf75838ca73dd43f626e268c79aa

henrylee2cn/gohbase,tempbottle/gohbase,tsuna/gohbase,dougklein/gohbase,dougklein/gohbase