[minor] polish

Author: qwazer

.gitignore

@@ -8,4 +8,5 @@ pom.xml.next
 release.properties
 dependency-reduced-pom.xml
 buildNumber.properties
-output
+output
+scheme2ddl.iml

pom.xml

@@ -59,6 +59,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-release-plugin</artifactId>
+                <version>2.5.3</version>
                 <configuration>
                     <tagNameFormat>v@{project.version}</tagNameFormat>
                     <useReleaseProfile>false</useReleaseProfile>