Prepare 1.4.0 release

Author: Giovds

README.md

@@ -24,7 +24,7 @@ Alternatively, you can integrate the plugin into your Maven project by adding th
         <plugin>
             <groupId>com.giovds</groupId>
             <artifactId>outdated-maven-plugin</artifactId>
-            <version>1.3.0</version>
+            <version>1.4.0</version>
             <configuration>
                 <!-- The maximum amount of inactive years allowed -->
                 <years>1</years>

pom.xml

@@ -5,7 +5,7 @@
 
     <groupId>com.giovds</groupId>
     <artifactId>outdated-maven-plugin</artifactId>
-    <version>1.4.0-SNAPSHOT</version>
+    <version>1.4.0</version>
     <packaging>maven-plugin</packaging>
 
     <name>The Outdated Maven Plugin</name>