Added spring-boot-starter-web for stub runner boot

fixes gh-840

spring-cloud-contract-stub-runner-boot/pom.xml

@@ -17,6 +17,10 @@
 			<groupId>org.springframework.cloud</groupId>
 			<artifactId>spring-cloud-starter-contract-stub-runner</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>