Use Correct License Name "Plexus"

[tisoft]

The pom.xml states that dom4j is using the BSD-3-Clause license, but the license text does not match that statement.

The license text matches the "Plexus Classworlds License".
The SPDX identifier is "Plexus", which would be the recomended entry for the name field in the pom.

https://spdx.org/licenses/Plexus.html

[codecov-commenter]

Codecov Report

Base: 39.94% // Head: 39.94% // No change to project coverage 👍

Coverage data is based on head (5cbef5b) compared to base (7fbdc6d).
Patch has no changes to coverable lines.

❗ Current head 5cbef5b differs from pull request most recent head cb96c84. Consider uploading reports for the commit cb96c84 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #98   +/-   ##
=========================================
  Coverage     39.94%   39.94%           
  Complexity     1494     1494           
=========================================
  Files           145      145           
  Lines          9492     9492           
  Branches       1192     1192           
=========================================
  Hits           3792     3792           
  Misses         5320     5320           
  Partials        380      380           

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[oglowa]

Well, I see that the license text of the plexus-license matches the best to the current license-text of this library, but I don't think, that is that, what the author want.
On The Homepage-FAQ it is mentioned, that the license is "Apache style".

"... We use an Apache-style open source license ..."

So I think it has to be synchronized:

• the FAQ-page
• the name in the build.gradle
• the used license-text