chore(package): update uglify-js to version 3.4.9 (#1916)
chore(package): update uglify-js to version 3.4.9 (#1916)

Closes #1865
MrRio/jsPDF,yWorks/jsPDF,MrRio/jsPDF,yWorks/jsPDF,MrRio/jsPDF,yWorks/jsPDF