MANIFEST.MF missing ImplementationVersion

[melloware]

Describe the bug
Looking at your Manifest its missing Implementation version.

This means in Java code I cannot detect the Morphia version using dev.morphia.Datastore.class.getPackage().getImplementationVersion() should return 2.3.1 or whatever version of the JAR it is.

Looks like you are missing the Maven JAR plugin to add these default entries.

<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                            <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>

[evanchooly]

easy enough fix. thanks.