Added maven-compiler-plugin version

Author: Rajeev Kumar Singh

java-csv-file-handling-with-opencsv/pom.xml

@@ -21,6 +21,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.7.0</version>
                 <configuration>
                     <source>1.8</source>
                     <target>1.8</target>