Remove explicit version for sample code, #302. (#303)

Signed-off-by: Pan Li <panli@microsoft.com>

samplecode/example/pom.xml

@@ -36,7 +36,6 @@
 		<dependency>
 			<groupId>org.springframework.data</groupId>
 			<artifactId>spring-data-rest-webmvc</artifactId>
-			<version>3.0.6.RELEASE</version>
 		</dependency>
 
 		<dependency>
@@ -47,7 +46,6 @@
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>
-			<version>2.0.3.RELEASE</version>
 		</dependency>
 	</dependencies>