Added boot property in benchmark

benchmarks/pom.xml

@@ -28,6 +28,7 @@
 		<sonar.skip>true</sonar.skip>
 		<maven.compiler.target>1.8</maven.compiler.target>
 		<maven.compiler.source>1.8</maven.compiler.source>
+		<spring-boot.version>2.0.0.BUILD-SNAPSHOT</spring-boot.version>
 	</properties>
 
 	<dependencyManagement>
@@ -43,7 +44,7 @@
 				<!-- Import dependency management from Spring Boot -->
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-dependencies</artifactId>
-				<version>2.0.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>