Add repositories section to dependencies POM

Inadvertently missed on commit 7732135a

Fixes gh-1413

spring-boot-dependencies/pom.xml

@@ -1313,4 +1313,26 @@
 			</plugins>
 		</pluginManagement>
 	</build>
+	<repositories>
+		<!--
+			Repositories to allow snapshot and milestone BOM imports during
+			development. This section is stripped out when a full release is prepared.
+		-->
+		<repository>
+			<id>spring-milestones</id>
+			<name>Spring Milestones</name>
+			<url>http://repo.spring.io/milestone</url>
+			<snapshots>
+				<enabled>false</enabled>
+			</snapshots>
+		</repository>
+		<repository>
+			<id>spring-snapshots</id>
+			<name>Spring Snapshots</name>
+			<url>http://repo.spring.io/snapshot</url>
+			<snapshots>
+				<enabled>true</enabled>
+			</snapshots>
+		</repository>
+	</repositories>
 </project>