Add missing dependency for the release plugin.

Author: eamonnmcmanus

pom.xml

@@ -117,6 +117,11 @@
         <artifactId>maven-release-plugin</artifactId>
         <version>2.5.3</version>
         <dependencies>
+          <dependency>
+            <groupId>org.apache.maven.scm</groupId>
+            <artifactId>maven-scm-api</artifactId>
+            <version>1.11.2</version>
+          </dependency>
           <dependency>
             <groupId>org.apache.maven.scm</groupId>
             <artifactId>maven-scm-provider-gitexe</artifactId>