compatibility issues

Author: xiaoguzhu

Assets/Examples/Bag/IconManager.cs

@@ -90,17 +90,13 @@ IEnumerator Run()
 			}
 
 			string url = _basePath + item.url + ".ab";
-#if UNITY_5_4_OR_NEWER
+#if UNITY_2017_2_OR_NEWER
 #if UNITY_2018_1_OR_NEWER
 			UnityWebRequest www = UnityWebRequestAssetBundle.GetAssetBundle(url);
 #else
 			UnityWebRequest www = UnityWebRequest.GetAssetBundle(url);
 #endif
-#if UNITY_2017_2_OR_NEWER
 			yield return www.SendWebRequest();
-#else
-			yield return www.Send();
-#endif
 
 			if (!www.isNetworkError && !www.isHttpError)
 			{

Assets/Examples/BundleUsage/BundleUsageMain.cs

@@ -27,17 +27,13 @@ IEnumerator LoadUIPackage()
 		if (Application.platform != RuntimePlatform.Android)
 			url = "file:///" + url;
 
-#if UNITY_5_4_OR_NEWER
+#if UNITY_2017_2_OR_NEWER
 #if UNITY_2018_1_OR_NEWER
 		UnityWebRequest www = UnityWebRequestAssetBundle.GetAssetBundle(url);
 #else
 		UnityWebRequest www = UnityWebRequest.GetAssetBundle(url);
 #endif
-#if UNITY_2017_2_OR_NEWER
 		yield return www.SendWebRequest();
-#else
-		yield return www.Send();
-#endif
 
 		if (!www.isNetworkError && !www.isHttpError)
 		{