upgrade deps

Author: mourner

package.json

@@ -48,11 +48,11 @@
   },
   "homepage": "https://github.com/mourner/flatbush#readme",
   "devDependencies": {
-    "eslint": "^4.19.0",
+    "eslint": "^4.19.1",
     "eslint-config-mourner": "^2.0.3",
-    "esm": "^3.0.8",
+    "esm": "^3.0.30",
     "rbush": "^2.0.2",
-    "rollup": "^0.57.1",
+    "rollup": "^0.58.2",
     "rollup-plugin-buble": "^0.19.2",
     "rollup-plugin-uglify": "^3.0.0",
     "tape": "^4.9.0"