gitignore changes

Author: Damian Staszewski

.gitignore

@@ -8,7 +8,11 @@ pom.xml.next
 release.properties
 dependency-reduced-pom.xml
 buildNumber.properties
-.mvn/**
+.mvn/timing.properties
+
+# Avoid ignoring Maven wrapper jar file (.jar files are usually ignored)
+!/.mvn/wrapper/maven-wrapper.jar
+
 !.github/
 
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