Add antrun plugin version

Author: Dave Syer

spring-boot-starters/spring-boot-starter-parent/pom.xml

@@ -104,6 +104,11 @@
 						</archive>
 					</configuration>
 				</plugin>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-antrun-plugin</artifactId>
+					<version>1.7</version>
+				</plugin>
 				<plugin>
 					<groupId>org.codehaus.mojo</groupId>
 					<artifactId>exec-maven-plugin</artifactId>