Update README.md

Author: eric-martin

README.md

@@ -22,7 +22,7 @@ var stackify = require('stackify-logger');
 stackify.start({apiKey: '***', env: 'dev'});
 ```
 The following options could be passed to the start method:
-* __apiKey: (Required)__ Stackify API key
+* __apiKey (Required):__ Stackify API key
 * __env:__ Environment name. If a Stackify agent is installed, this does not need to be set. If a Stackify agent is not installed, this should be set to the environment name.
 * __proxy:__ HTTP proxy
 * __debug:__ Enables internal debug logging for troubleshooting. Defaults to false.