Replace istanbul with nyc

Author: wooorm

.gitignore

@@ -1,5 +1,6 @@
 .DS_Store
 *.log
+.nyc_output/
 coverage/
 node_modules/
 nlcst-emoticon-modifier.js

package.json

@@ -23,8 +23,8 @@
     "emoticon": "^2.0.0",
     "esmangle": "^1.0.0",
     "is-hidden": "^1.1.0",
-    "istanbul": "^0.4.0",
     "negate": "^1.0.0",
+    "nyc": "^9.0.1",
     "remark-cli": "^2.1.0",
     "remark-preset-wooorm": "^1.0.0",
     "retext": "^4.0.0",
@@ -34,8 +34,7 @@
   },
   "scripts": {
     "test-api": "node test",
-    "test-coverage": "istanbul cover tape test/index.js",
-    "test-travis": "npm run test-coverage",
+    "test-coverage": "nyc --reporter lcov tape test/index.js",
     "test": "npm run test-api",
     "lint": "xo",
     "make": "npm run lint && npm run test-coverage",
@@ -45,6 +44,12 @@
     "build-md": "remark . --quiet --frail --output",
     "build": "npm run build-data && npm run bundle && npm run build-md"
   },
+  "nyc": {
+    "check-coverage": true,
+    "lines": 100,
+    "functions": 100,
+    "branches": 100
+  },
   "xo": {
     "space": true,
     "rules": {