Upgrade maven-enforcer-plugin to 3.0.0-M3

Change-Id: Ie6b090ada9bcb36e018b0f991c09307f79655ba4
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

pom.xml

diff --git a/pom.xml b/pom.xml
index e5a6fee..7e70a08 100644
--- a/pom.xml
+++ b/pom.xml
@@ -430,7 +430,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-enforcer-plugin</artifactId>
-        <version>3.0.0-M2</version>
+        <version>3.0.0-M3</version>
         <executions>
           <execution>
             <id>enforce-maven</id>