fix: test in safari latest (not pinned, which was a workaround for sauce labs for awhile)

Author: treshugart

karma.browsers.js

@@ -46,7 +46,7 @@ const browsers = {
   safari_latest: {
     browserName: 'safari',
     platform: 'OS X 10.11',
-    version: '9',
+    version: 'latest'
   },
 
   // IE