Merge pull request #245 from groovy/maven_325

Require Maven 3.2.5 minimum (closes 244)

pom.xml

@@ -5,12 +5,12 @@
   <groupId>org.codehaus.gmavenplus</groupId>
   <artifactId>gmavenplus-plugin</artifactId>
   <packaging>maven-plugin</packaging>
-  <version>2.1.1-SNAPSHOT</version>
+  <version>3.0.0-SNAPSHOT</version>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-    <mavenVersion>3.0</mavenVersion>
+    <mavenVersion>3.2.5</mavenVersion>
     <jacocoPluginVersion>0.8.10</jacocoPluginVersion>
     <javadocPluginVersion>3.5.0</javadocPluginVersion>
     <shortJavaVersion>8</shortJavaVersion>
@@ -35,6 +35,12 @@
       <version>${mavenVersion}</version>
       <scope>provided</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-compat</artifactId>
+      <version>${mavenVersion}</version>
+      <scope>provided</scope>
+    </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-core</artifactId>
@@ -315,7 +321,7 @@
             <configuration>
               <rules>
                 <requireMavenVersion>
-                  <version>[3.3.9,)</version>
+                  <version>[3.9.2,)</version>
                 </requireMavenVersion>
                 <requireJavaVersion>
                   <version>[1.11,)</version>