update code

pom.xml

@@ -4,6 +4,18 @@
 	<groupId>EasyCaptcha</groupId>
 	<artifactId>EasyCaptcha</artifactId>
 	<version>1.1.0-RELEASE</version>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<configuration>
+					<source>6</source>
+					<target>6</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
 	<name>EasyCaptcha</name>
 
 	<dependencies>