Docx4j 8.1.0 released

[jason]

docx4j 8.1.0 was published in Maven Central on 21 May 2019.

To use it via Maven, just add one and only one of docx4j-JAXB-Internal, docx4j-JAXB-MOXy,
or docx4j-JAXB-ReferenceImpl to your pom. https://search.maven.org/search?q=g:org.docx4j

Otherwise, see https://www.docx4java.org/downloads.html

Minimum supported Java version is 8.0

The most notable changes in docx4j 8.1.0:

* Update [MS-PPTX] and [MS-ODRAWXML] content models with latest schemas. (These are Microsoft extensions to the ECMA/ISO standard, required for features introduced in Office 2010, 2013, or 2016. For example, Powerpoint sections)

* Re-packaged subset of Guava, so Guava dep is no longer required, shavng 2.4MB off deps size

For other changes, please see https://github.com/plutext/docx4j/blob/ ... ANGELOG.md