update parent pom and set version number to 3.0.0-SNAPSHOT

Author: stefanseifert

pom.xml

@@ -25,12 +25,12 @@ under the License.
   <parent>
     <artifactId>maven-plugins</artifactId>
     <groupId>org.apache.maven.plugins</groupId>
-    <version>28-SNAPSHOT</version>
-    <relativePath>../../pom/maven/maven-plugins/pom.xml</relativePath>
+    <version>28</version>
+    <relativePath/>
   </parent>
 
   <artifactId>maven-eclipse-plugin</artifactId>
-  <version>3.0-SNAPSHOT</version>
+  <version>3.0.0-SNAPSHOT</version>
   <packaging>maven-plugin</packaging>
 
   <name>Apache Maven Eclipse Plugin</name>
@@ -292,6 +292,7 @@ under the License.
           <configuration>
             <excludes combine.children="append">
               <exclude>README-testing.txt</exclude>
+              <exclude>README.md</exclude>
 
               <!--
                 These files contain several files for eclipse