Apply spotless re-formatting

Detected in the course of support-and-care/maven-support-and-care#77.

Author: ascheman

README.md

@@ -1,5 +1,5 @@
 Plexus-Interpolation
-===============
+====================
 
 [![Maven Central](https://img.shields.io/maven-central/v/org.codehaus.plexus/plexus-interpolation.svg?label=Maven%20Central)](http://search.maven.org/artifact/org.codehaus.plexus/plexus-interpolation)
 [![Reproducible Builds](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/jvm-repo-rebuild/reproducible-central/master/content/org/codehaus/plexus/plexus-interpolation/badge.json)](https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/codehaus/plexus/plexus-interpolation/README.md)