Use snapshot and milestone repositories instead of libs-snapshot and libs-milestone.

Closes #2595

README.adoc

@@ -86,9 +86,9 @@ If you'd rather like the latest snapshots of the upcoming major version, use our
 </dependency>
 
 <repository>
-  <id>spring-libs-snapshot</id>
+  <id>spring-snapshot</id>
   <name>Spring Snapshot Repository</name>
-  <url>https://repo.spring.io/libs-snapshot</url>
+  <url>https://repo.spring.io/snapshot</url>
 </repository>
 ----
 

pom.xml

@@ -318,24 +318,27 @@
 		</plugins>
 	</build>
 
-	<repositories>
-		<repository>
-			<id>spring-libs-snapshot</id>
-			<url>https://repo.spring.io/libs-snapshot</url>
-		</repository>
-	</repositories>
-
-	<pluginRepositories>
-		<pluginRepository>
-			<id>spring-plugins-release</id>
-			<url>https://repo.spring.io/plugins-release</url>
-		</pluginRepository>
-	</pluginRepositories>
-
 	<profiles>
 		<profile>
 			<!-- placeholder for no profile -->
 			<id>none</id>
 		</profile>
 	</profiles>
+
+	<repositories>
+		<repository>
+			<id>spring-snapshot</id>
+			<url>https://repo.spring.io/snapshot</url>
+			<snapshots>
+				<enabled>true</enabled>
+			</snapshots>
+			<releases>
+				<enabled>false</enabled>
+			</releases>
+		</repository>
+		<repository>
+			<id>spring-milestone</id>
+			<url>https://repo.spring.io/milestone</url>
+		</repository>
+	</repositories>
 </project>

src/main/asciidoc/reference/redis.adoc

@@ -49,7 +49,7 @@ To create a Spring project in STS:
   <repository>
     <id>spring-milestone</id>
     <name>Spring Maven MILESTONE Repository</name>
-    <url>https://repo.spring.io/libs-milestone</url>
+    <url>https://repo.spring.io/milestone</url>
   </repository>
 </repositories>
 ----