[maven-release-plugin] prepare release 2.2

pom.xml

@@ -1,11 +1,10 @@
 <?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>com.github.terrytsai</groupId>
     <artifactId>escpos</artifactId>
-    <version>2.2-SNAPSHOT</version>
+    <version>2.2</version>
 
     <name>EscPos</name>
     <description>A basic Java ESC/POS implementation for receipt printers</description>
@@ -30,7 +29,7 @@
         <connection>scm:git:https://github.com/TerryTsai/EscPos.git</connection>
         <developerConnection>scm:git:https://github.com/TerryTsai/EscPos.git</developerConnection>
         <url>https://github.com/TerryTsai/EscPos</url>
-        <tag>${project.version}</tag>
+        <tag>2.2</tag>
     </scm>
 
     <distributionManagement>