Removed erroneous entry from plugin-maven CHANGES.md.

plugin-maven does not have a Groovy extension.
#237 is transparent for the plugin-maven users.

Author: fvgh

plugin-maven/CHANGES.md

@@ -2,7 +2,6 @@
 
 ### Version 1.15.0-SNAPSHOT - TBD ([javadoc](https://diffplug.github.io/spotless/javadoc/spotless-maven-plugin/snapshot/), [snapshot](https://oss.sonatype.org/content/repositories/snapshots/com/diffplug/spotless/spotless-maven-plugin/))
 
-* Gradle/Groovy `importOrder` no longer adds semicolons. ([#237](https://github.com/diffplug/spotless/issues/237))
 * Skip `package-info.java` and `module-info.java` files from license header formatting. ([#273](https://github.com/diffplug/spotless/pull/273))
 * Updated JSR305 annotation from 3.0.0 to 3.0.2 ([#274](https://github.com/diffplug/spotless/pull/274))
 * Migrated from FindBugs annotations 3.0.0 to SpotBugs annotations 3.1.6 ([#274](https://github.com/diffplug/spotless/pull/274))