Change update file configuration.

With Spring Boot 2.x , the servlet update file configuration has changed.

Change the configuration

spring.http.multipart.max-file-size=1024KB
spring.http.multipart.max-request-size=1024KB

to

spring.servlet.multipart.max-file-size=1024KB
spring.servlet.multipart.max-request-size=1024KB

See #4.

Update version to Spring Boot 2.0.3.RELEASE

Update version as follower:

• MongoDB 3.6.4
• Spring Boot 2.0.3.RELEASE
• Spring Data MongoDB 2.0.8.RELEASE
• Spring 5.0.7.RELEASE
• Thymeleaf 3.0.9.RELEASE
• Thymeleaf Layout Dialect 2.2.0
• Embedded MongoDB 2.0.2
• Gradle 4.5.1