Syntax fix in README.md
Syntax fix in README.md

`{ "foo" => "bar" }` -> `{ "foo": "bar" }`

mgenereu/node-dtrace-provider,dieface/node-dtrace-provider,mgenereu/node-dtrace-provider,DataSweeper/node-dtrace-provider,tjfontaine/node-dtrace-provider,mgenereu/node-dtrace-provider,tjfontaine/node-dtrace-provider,DataSweeper/node-dtrace-provider,tjfontaine/node-dtrace-provider,DataSweeper/node-dtrace-provider,dieface/node-dtrace-provider,dieface/node-dtrace-provider,DataSweeper/node-dtrace-provider,mgenereu/node-dtrace-provider,tjfontaine/node-dtrace-provider,dieface/node-dtrace-provider