Merge pull request #4774 from plotly/bump-es6-promise-april20

bump es6-promise v4

Author: archmoj

package-lock.json

@@ -72,7 +72,7 @@
     "d3-hierarchy": "^1.1.9",
     "d3-interpolate": "^1.4.0",
     "delaunay-triangulate": "^1.1.6",
-    "es6-promise": "^3.0.2",
+    "es6-promise": "^4.2.8",
     "fast-isnumeric": "^1.1.4",
     "gl-cone3d": "^1.5.2",
     "gl-contour2d": "^1.1.7",