change date for spring tutorial

Author: andimarek

content/tutorials/getting-started-with-spring-boot.md

@@ -3,7 +3,7 @@ title = "Getting started with GraphQL Java and Spring Boot"
 author = "Andreas Marek"
 tags = ["spring", "tutorial"]
 categories = []
-date = 2019-01-23
+date = 2019-01-31
 toc = "true"
 +++