Update uglify-js to v3.15.2 (#562)

* Update uglify-js to v3.15.2

Signed-off-by: Nacho García <hello@nachogarcia.dev>

* update tests

Co-authored-by: alexlamsl <alexlamsl@gmail.com>

Author: nachogarcia

package-lock.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "chalk": "^2.4.1",
     "maxmin": "^2.1.0",
-    "uglify-js": "^3.13.10",
+    "uglify-js": "^3.15.2",
     "uri-path": "^1.0.0"
   },
   "devDependencies": {

package.json

@@ -1,3 +1,2 @@
 // banner without sourcemap
-
 var longNameA=1,longNameB=2;function longFunctionC(n,o){return longNameA+longNameB+n+o}var result=longFunctionC(3,4);

test/fixtures/expected/compress_mangle_banner.js

@@ -1,4 +1,5 @@
-!function(){var square=function(x){return x*x},list=[1,2,3,4,5],math={root:Math.sqrt,square:square,
-cube:function(x){return x*square(x)}};"undefined"!=typeof elvis&&null!=elvis&&alert("I knew it!"),
-function(accum$){for(var i$=0,length$=list.length;i$<length$;++i$)accum$.push(math.cube(list[i$]))
-;return accum$}.call(this,[])}.call(this);
+!function(){var list,math,square;square=function(x){return x*x},list=[1,2,3,4,5],math={
+root:Math.sqrt,square:square,cube:function(x){return x*square(x)}},
+"undefined"!=typeof elvis&&null!=elvis&&alert("I knew it!"),function(accum$){for(var i$=0,
+length$=list.length;i$<length$;++i$)accum$.push(math.cube(list[i$]));return accum$}.call(this,[])
+}.call(this);