README.md: update recommended version to 3.5.1
README.md: update recommended version to 3.5.1

eyalg1972/nar-maven-plugin,maven-nar/nar-maven-plugin,maven-nar/nar-maven-plugin,dmakarov/nar-maven-plugin,heathn/nar-maven-plugin,maven-nar/nar-maven-plugin,heathn/nar-maven-plugin,maven-nar/nar-maven-plugin,dmakarov/nar-maven-plugin,markjohndoyle/nar-maven-plugin,dugilos/nar-maven-plugin,dugilos/nar-maven-plugin,markjohndoyle/nar-maven-plugin,heathn/nar-maven-plugin,dugilos/nar-maven-plugin,dmakarov/nar-maven-plugin,maven-nar/nar-maven-plugin,dugilos/nar-maven-plugin,eyalg1972/nar-maven-plugin,markjohndoyle/nar-maven-plugin,eyalg1972/nar-maven-plugin,dmakarov/nar-maven-plugin,heathn/nar-maven-plugin,markjohndoyle/nar-maven-plugin,dmakarov/nar-maven-plugin,markjohndoyle/nar-maven-plugin,dugilos/nar-maven-plugin,heathn/nar-maven-plugin,eyalg1972/nar-maven-plugin,eyalg1972/nar-maven-plugin