Replace nyc with c8

.gitignore

@@ -1,6 +1,5 @@
 .DS_Store
 *.log
-.nyc_output/
 coverage/
 node_modules/
 packages/franc-all/index.js

package.json

@@ -8,13 +8,13 @@
   "author": "Titus Wormer <tituswormer@gmail.com> (http://wooorm.com)",
   "devDependencies": {
     "alpha-sort": "^3.0.0",
+    "c8": "^7.0.0",
     "format": "^0.2.0",
     "human-format": "^0.11.0",
     "is-hidden": "^1.0.0",
     "iso-639-3": "^2.0.0",
     "lerna": "^3.0.0",
     "negate": "^1.0.0",
-    "nyc": "^15.0.0",
     "parse-author": "^2.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^9.0.0-alpha.1",
@@ -37,16 +37,10 @@
     "postinstall": "lerna bootstrap --no-ci",
     "generate": "node script/build",
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "test-api": "node test",
-    "test-coverage": "nyc --reporter lcov tape test/index.js",
+    "test-api": "node --conditions development test/index.js",
+    "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov npm run test-api",
     "test": "npm run generate && npm run format && npm run test-coverage"
   },
-  "nyc": {
-    "check-coverage": true,
-    "lines": 100,
-    "functions": 100,
-    "branches": 100
-  },
   "prettier": {
     "tabWidth": 2,
     "useTabs": false,