[MTOOLCHAINS-40] Parent to 36, Maven 3.2.5 and Java 8 (#9)

Update project:
* update parent POM 36
* update to Maven 3.2.5
* make it Java8

pom.xml

@@ -25,7 +25,7 @@ under the License.
   <parent>
     <artifactId>maven-plugins</artifactId>
     <groupId>org.apache.maven.plugins</groupId>
-    <version>34</version>
+    <version>36</version>
     <relativePath />
   </parent>
 
@@ -71,8 +71,8 @@ under the License.
   </contributors>
 
   <properties>
-    <mavenVersion>3.1.0</mavenVersion>
-    <javaVersion>7</javaVersion>
+    <javaVersion>8</javaVersion>
+    <mavenVersion>3.2.5</mavenVersion>
     <project.build.outputTimestamp>2020-04-07T21:04:00Z</project.build.outputTimestamp>
   </properties>
 
@@ -81,11 +81,13 @@ under the License.
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-plugin-api</artifactId>
       <version>${mavenVersion}</version>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-core</artifactId>
       <version>${mavenVersion}</version>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.maven.plugin-tools</groupId>
@@ -99,7 +101,6 @@ under the License.
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jxr-plugin</artifactId>
-        <version>3.0.0</version>
       </plugin>
     </plugins>
   </reporting>