upgrade deps

.travis.yml

@@ -1,4 +1,4 @@
 language: node_js
 node_js:
-  - "10"
+  - "12"
   - node

index.js

@@ -3,7 +3,7 @@
 var RBush = require('rbush');
 var Queue = require('tinyqueue');
 var pointInPolygon = require('point-in-polygon');
-const orient = require('robust-predicates/umd/orient2d.min.js').orient2d;
+var orient = require('robust-predicates/umd/orient2d.min.js').orient2d;
 
 // Fix for require issue in webpack https://github.com/mapbox/concaveman/issues/18
 if (Queue.default) {

package.json

@@ -4,15 +4,15 @@
   "description": "Fast 2D concave hull algorithm in JavaScript (generates an outline of a point set)",
   "main": "index.js",
   "dependencies": {
-    "point-in-polygon": "^1.0.1",
-    "rbush": "^3.0.0",
+    "point-in-polygon": "^1.1.0",
+    "rbush": "^3.0.1",
     "robust-predicates": "^2.0.4",
     "tinyqueue": "^2.0.3"
   },
   "devDependencies": {
-    "eslint": "^7.0.0",
+    "eslint": "^7.32.0",
     "eslint-config-mourner": "^2.0.1",
-    "tape": "^5.0.0"
+    "tape": "^5.3.1"
   },
   "scripts": {
     "pretest": "eslint index.js test/*.js",