fix maven complier plugin

 # 2018-JAVA-Cesco
 Detecting fraud clicks using machine learning 
+
+## execution script
+### Amazon Linux
+```bash
+# update
+sudo yum update -y
+
+# install git
+sudo yum install git -y
+
+# install maven
+sudo wget http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo -O /etc/yum.repos.d/epel-apache-maven.repo
+sudo sed -i s/\$releasever/6/g /etc/yum.repos.d/epel-apache-maven.repo
+sudo yum install -y apache-maven
+mvn --version
+
+
+```
\ No newline at end of file

@@ -18,11 +18,6 @@
         </dependency>
         <dependency>
             <groupId>org.apache.spark</groupId>
-            <artifactId>spark-sql_2.11</artifactId>
-            <version>2.3.0</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.spark</groupId>
             <artifactId>spark-mllib_2.11</artifactId>
             <version>2.3.0</version>
         </dependency>
@@ -43,11 +38,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.6.1</version>
-                <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
-                </configuration>
+                <version>3.7.0</version>
             </plugin>
         </plugins>
     </build>