Add Spring snapshot repository as plugin repository.

To resolve Spring Boot Maven plugin snapshots.

Author: odrotbohm

pom.xml

@@ -186,6 +186,13 @@
 				<enabled>false</enabled>
 			</snapshots>
 		</pluginRepository>
+		<pluginRepository>
+			<id>spring-snapshot</id>
+			<url>https://repo.spring.io/snapshot</url>
+			<releases>
+				<enabled>false</enabled>
+			</releases>
+		</pluginRepository>
 	</pluginRepositories>
 
 	<build>