Upgrade dependencies which are unlikely to break Mapscii

package.json

@@ -32,10 +32,10 @@
     "@mapbox/vector-tile": "^1.3.1",
     "bluebird": "^3.5.3",
     "bresenham": "0.0.4",
-    "earcut": "^2.1.3",
+    "earcut": "^2.1.5",
     "keypress": "^0.2.1",
     "node-fetch": "^2.3.0",
-    "pbf": "^3.1.0",
+    "pbf": "^3.2.0",
     "rbush": "^2.0.2",
     "simplify-js": "^1.2.3",
     "string-width": "^2.1.1",
@@ -44,7 +44,7 @@
     "x256": "0.0.2"
   },
   "devDependencies": {
-    "eslint": "^5.9.0",
-    "jest": "^23.6.0"
+    "eslint": "^5.15.3",
+    "jest": "^24.5.0"
   }
 }