Add Automatic-Module-Name to support JPMS

[dbwiddis]

To permit modularized projects to access non-modular JARs, Java 9+ allows importing JAR files without a module-info.class as "automatic modules".

Per the ModuleFinder javadoc:

If the JAR file has the attribute "Automatic-Module-Name" in its main manifest then its value is the module name. The module name is otherwise derived from the name of the JAR file.

The automatic name generation without such an entry extracts the version information and then substitutes a dot for all non-alphanumeric characters. In the case of code-assert-0.9.11.jar the resulting module name is code.assert which is illegal due to the reserved word assert, making this project unusable as a module.

This commit leverages the maven-jar-plugin to generate a manifest file including a legal Automatic-Module-Name.

[codecov-commenter]

Codecov Report

Merging #40 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #40   +/-   ##
=========================================
  Coverage     81.67%   81.67%           
  Complexity     1139     1139           
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  Files           105      105           
  Lines          3050     3050           
  Branches        433      433           
=========================================
  Hits           2491     2491           
  Misses          415      415           
  Partials        144      144           

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