update Android version to 1.2.1

Example/Logan-Android/gradle.properties

@@ -17,4 +17,4 @@ org.gradle.jvmargs=-Xmx1536m
 # org.gradle.parallel=true
 groupId=com.dianping.android.sdk
 artifactId=logan
-versionCode=1.1.0
+versionCode=1.2.1

README-zh.md

@@ -24,7 +24,7 @@ Logan是美团点评集团移动端基础日志组件。名称是Log和An的组
 在项目的`build.gradle`文件中添加：
 
 ```groovy
-compile 'com.dianping.android.sdk:logan:1.1.0'
+compile 'com.dianping.android.sdk:logan:1.2.1'
 ```
 
 ### Usage
@@ -77,10 +77,17 @@ public class RealSendLogRunnable extends SendLogRunnable {
     @Override
     public void sendLog(File logFile) {
       // logFile为预处理过后即将要上传的日志文件
+      // 在此方法最后必须调用finish方法
+      finish();
+      if (logFile.getName().contains(".copy")) {
+				logFile.delete();
+			}
     }
 }
 ```
 
+**注意：在sendLog方法的最后必须调用finish方法**。如上面代码所示。
+
 最后需要调用Logan的send方法：
 
 ```java

README.md

@@ -24,12 +24,12 @@ If you want to build the source, make sure your NDK version is not higher than *
 Add the following content in the project `build.gradle` file:
 
 ```groovy
-compile 'com.dianping.android.sdk:logan:1.1.0'
+compile 'com.dianping.android.sdk:logan:1.2.1'
 ```
 
 ### Usage
 
-You must init Logan before you use it. For example:
+**You must init Logan before you use it**. For example:
 
 ```java
 LoganConfig config = new LoganConfig.Builder()
@@ -78,10 +78,17 @@ public class RealSendLogRunnable extends SendLogRunnable {
     @Override
     public void sendLog(File logFile) {
       // logFile: After the pretreatment is going to upload the log file
+      // Must Call finish after send log
+      finish();
+      if (logFile.getName().contains(".copy")) {
+				logFile.delete();
+			}
     }
 }
 ```
 
+**NOTE: You must call finish method after send log**. As written in the code above
+
 Finally you need to call Logan.s method:
 
 ```java