fix:fix initWithPlainTextAccessKey in android but we do not suggest use it

README-CN.md

 AliyunOSS.enableDevMode()
 ```
 
-### initWithPlainTextAccessKey
+### initWithPlainTextAccessKey(不建议)
 
-该接口需要通过明文授权acckeyId和accekeySecret，使用可查看
+该接口需要通过明文授权acckeyId和accekeySecret，开发者这可以使用，但是我们不建议
 
 ```javascript
 const endPoint = "XXX"

README.md

 
 ### initWithPlainTextAccessKey
 
-init auth client with accessKeyId and accessKeySecret,please refer to the code.
+init auth client with accessKeyId and accessKeySecret,please refer to the code.you can use ,but we do not suggest use it。
 
 ```javascript
 const endPoint = "XXX"

android/src/main/java/com/reactlibrary/AliyunAuthManager.java

 import com.alibaba.sdk.android.oss.common.auth.OSSCredentialProvider;
 import com.alibaba.sdk.android.oss.common.auth.OSSCustomSignerCredentialProvider;
 import com.alibaba.sdk.android.oss.common.auth.OSSFederationCredentialProvider;
+import com.alibaba.sdk.android.oss.common.auth.OSSPlainTextAKSKCredentialProvider;
 import com.alibaba.sdk.android.oss.common.auth.OSSFederationToken;
 import com.alibaba.sdk.android.oss.common.auth.OSSStsTokenCredentialProvider;
 import com.alibaba.sdk.android.oss.common.utils.IOUtils;
                                            String accessKeySecret,
                                            String endPoint,
                                            ReadableMap configuration) {
-        OSSCredentialProvider credentialProvider = new OSSFederationCredentialProvider() {
-            @Override
-            public OSSFederationToken getFederationToken() {
-                try {
-                    URL stsUrl = new URL("http://yourip:port");
-                    HttpURLConnection conn = (HttpURLConnection) stsUrl.openConnection();
-                    InputStream input = conn.getInputStream();
-                    String jsonText = IOUtils.readStreamAsString(input, OSSConstants.DEFAULT_CHARSET_NAME);
-                    JSONObject jsonObjs = new JSONObject(jsonText);
-                    String ak = jsonObjs.getString("AccessKeyId");
-                    String sk = jsonObjs.getString("AccessKeySecret");
-                    String token = jsonObjs.getString("SecurityToken");
-                    String expiration = jsonObjs.getString("Expiration");
-                    return new OSSFederationToken(ak, sk, token, expiration);
-                } catch (Exception e) {
-                    e.printStackTrace();
-                }
-                return null;
-            }
-        };
 
+        OSSCredentialProvider credentialProvider = new OSSPlainTextAKSKCredentialProvider(accessKeyId,accessKeySecret);
         // init conf
         ClientConfiguration conf = ConfigUtils.initAuthConfig(configuration);