[maven-release-plugin] prepare release java-otp-0.3.1

pom.xml

@@ -1,11 +1,10 @@
 <?xml version="1.0"?>
-<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.eatthepath</groupId>
     <artifactId>java-otp</artifactId>
-    <version>0.3.1-SNAPSHOT</version>
+    <version>0.3.1</version>
     <name>java-otp</name>
     <description>A one-time password (HOTP and TOTP) library for Java</description>
     <inceptionYear>2016</inceptionYear>
@@ -15,7 +14,7 @@
         <connection>scm:git:https://github.com/jchambers/java-otp.git</connection>
         <developerConnection>scm:git:git@github.com:jchambers/java-otp.git</developerConnection>
         <url>https://github.com/jchambers/java-otp</url>
-        <tag>HEAD</tag>
+        <tag>java-otp-0.3.1</tag>
     </scm>
 
     <developers>