Update OS X test targets for Saucelabs (close snowplow#632)

Author: mhadam

tests/intern.js

@@ -44,8 +44,8 @@ define({
 		{ browserName: 'internet explorer', version: '9', platform: 'Windows 7' },
 		{ browserName: 'firefox', version: '27', platform: [ 'Windows 7', 'Linux' ] },
 		{ browserName: 'chrome', version: '32', platform: [ 'Windows 7', 'Linux' ] },
-		{ browserName: 'safari', version: '6', platform: 'OS X 10.8' },
-		{ browserName: 'safari', version: '7', platform: 'OS X 10.9' }
+		{ browserName: 'safari', version: '8', platform: 'OS X 10.10' },
+		{ browserName: 'safari', version: '10', platform: 'OS X 10.11' }
 	],
 
 	maxConcurrency: 1,