[CI Skip] prepare release microsphere-build-0.0.21

pom.xml

@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>io.github.microsphere-projects</groupId>
     <artifactId>microsphere-build</artifactId>
-    <version>0.0.21-SNAPSHOT</version>
+    <version>0.0.21</version>
     <packaging>pom</packaging>
 
     <name>Microsphere :: Build</name>
@@ -38,7 +37,7 @@
         <url>[email protected]:microsphere-projects/microsphere-build.git</url>
         <connection>scm:git:${project.scm.url}</connection>
         <developerConnection>scm:git:${project.scm.url}</developerConnection>
-        <tag>HEAD</tag>
+        <tag>microsphere-build-0.0.21</tag>
     </scm>
 
     <properties>
@@ -298,7 +297,7 @@
                             </goals>
                             <configuration>
                                 <rules>
-                                    <banDuplicatePomDependencyVersions/>
+                                    <banDuplicatePomDependencyVersions />
                                 </rules>
                             </configuration>
                         </execution>