Build: Update tested browsers

Closes #120

Author: mgol

build/browserstack-current.json

@@ -14,7 +14,7 @@
 		"edge_latest",
 		{
 			"os": "iOS",
-			"os_version": "10.0",
+			"os_version": "11.0",
 			"real_mobile": false
 		}
 	]

build/browserstack-legacy.json

@@ -9,6 +9,7 @@
 		"chrome_previous",
 		"firefox_previous",
 		"safari_previous",
+		"edge_previous",
 		"ie_9",
 		"ie_10",
 		{
@@ -25,6 +26,11 @@
 			"os": "iOS",
 			"os_version": "9.3",
 			"real_mobile": false
+		},
+		{
+			"os": "iOS",
+			"os_version": "10.3",
+			"real_mobile": false
 		}
 	]
 }