Update READme.md

Author: legah2045

nexus-installation/READme.md

@@ -36,6 +36,7 @@ sudo yum install java-11-openjdk-devel java-1.8.0-openjdk-devel -y
 sudo wget http://download.sonatype.com/nexus/3/nexus-3.15.2-01-unix.tar.gz 
 sudo tar -zxvf nexus-3.15.2-01-unix.tar.gz
 sudo mv /opt/nexus-3.15.2-01 /opt/nexus
+sudo rm -rf nexus-3.15.2-01-unix.tar.gz
 ```
 
 ## Grant permissions for nexus user to start and manage nexus service