chore(karma): use Edge v15

gkalpak · gkalpak · commit 40fabdf8df60 · 2017-06-08T15:50:26.000+03:00
diff --git a/karma-shared.conf.js b/karma-shared.conf.js
@@ -78,7 +78,7 @@ module.exports = function(config, specificOptions) {
         base: 'SauceLabs',
         browserName: 'microsoftedge',
         platform: 'Windows 10',
-        version: '14'
+        version: '15'
       },
       'SL_iOS': {
         base: 'SauceLabs',
