Update maven-enforcer-plugin to 3.0.0-M3

Change-Id: I5121415523b01994338c4097a8437a677d08b954
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
diff --git a/org.eclipse.jgit.packaging/pom.xml b/org.eclipse.jgit.packaging/pom.xml
index e0b7e3d..4eb9b24 100644
--- a/org.eclipse.jgit.packaging/pom.xml
+++ b/org.eclipse.jgit.packaging/pom.xml
@@ -165,7 +165,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-enforcer-plugin</artifactId>
-        <version>3.0.0-M1</version>
+        <version>3.0.0-M3</version>
         <executions>
           <execution>
             <id>enforce-maven</id>