add automatic module name to jar manifest

This allows downstream projects using lambda to publish their own jars as
modules without switching lambda itself to a jigsaw module.

Author: Sebastian Hoß

pom.xml

@@ -103,6 +103,13 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
                 <version>${maven-jar-plugin.version}</version>
+                <configuration>
+                    <archive>
+                        <manifestEntries>
+                            <Automatic-Module-Name>com.jnape.palatable.lambda</Automatic-Module-Name>
+                        </manifestEntries>
+                    </archive>
+                </configuration>
                 <executions>
                     <execution>
                         <goals>