remove coveralls, switch to c8 for coverage, upgrade deps

.travis.yml

@@ -1,7 +1,4 @@
 language: node_js
 node_js:
   - "node"
-  - "6"
-script:
-  - npm test
-  - npm run coveralls
+  - "10"

README.md

@@ -1,7 +1,6 @@
 ## geojson-vt — GeoJSON Vector Tiles
 
 [![Build Status](https://travis-ci.org/mapbox/geojson-vt.svg?branch=master)](https://travis-ci.org/mapbox/geojson-vt)
-[![Coverage Status](https://coveralls.io/repos/mapbox/geojson-vt/badge.svg)](https://coveralls.io/r/mapbox/geojson-vt)
 
 A highly efficient JavaScript library for **slicing GeoJSON data into vector tiles on the fly**,
 primarily designed to enable rendering and interacting with large geospatial datasets

package.json

@@ -20,15 +20,14 @@
   "unpkg": "geojson-vt.js",
   "devDependencies": {
     "benchmark": "^2.1.4",
-    "coveralls": "^3.0.2",
-    "eslint": "^5.12.1",
+    "c8": "^5.0.1",
+    "eslint": "^5.16.0",
     "eslint-config-mourner": "^3.0.0",
-    "esm": "^3.1.1",
-    "nyc": "^13.1.0",
-    "rollup": "^1.1.2",
+    "esm": "^3.2.25",
+    "rollup": "^1.14.2",
     "rollup-plugin-buble": "^0.19.6",
-    "rollup-plugin-terser": "^4.0.2",
-    "tape": "^4.9.2"
+    "rollup-plugin-terser": "^5.0.0",
+    "tape": "^4.10.2"
   },
   "eslintConfig": {
     "extends": "mourner",
@@ -39,8 +38,7 @@
   "license": "ISC",
   "scripts": {
     "pretest": "eslint src/*.js test/*.js debug/viz.js",
-    "test": "nyc --require esm tape test/test-*.js",
-    "coveralls": "nyc report --reporter=text-lcov | coveralls",
+    "test": "c8 --check-coverage --branches 100 tape -r esm test/test-*.js",
     "build": "rollup -c",
     "watch": "rollup -cw",
     "prepublishOnly": "npm run test && npm run build"