Pick up plugin version from parent POM
diff --git a/pom.xml b/pom.xml
index 0115582..505373d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -284,7 +284,6 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>exec-maven-plugin</artifactId>
-        <version>3.2.0</version>
         <configuration>
           <mainClass>org.apache.commons.scxml2.test.StandaloneJexlExpressions</mainClass>
           <classpathScope>test</classpathScope>
@@ -497,7 +496,6 @@
           <plugin>
             <groupId>org.codehaus.mojo</groupId>
             <artifactId>exec-maven-plugin</artifactId>
-            <version>3.2.0</version>
             <executions>
               <execution>
                 <phase>test</phase>
@@ -553,7 +551,6 @@
           <plugin>
             <groupId>org.codehaus.mojo</groupId>
             <artifactId>exec-maven-plugin</artifactId>
-            <version>3.2.0</version>
             <executions>
               <execution>
                 <phase>test</phase>
@@ -604,7 +601,6 @@
           <plugin>
             <groupId>org.codehaus.mojo</groupId>
             <artifactId>exec-maven-plugin</artifactId>
-            <version>3.2.0</version>
             <executions>
               <execution>
                 <phase>test</phase>