use nyc/babel-plugin-istanbul instead of isparta

.babelrc

@@ -1,4 +1,9 @@
 {
   "presets": ["es2015", "stage-1", "flow"],
-  "plugins": ["transform-runtime"]
+  "plugins": ["transform-runtime"],
+  "env": {
+    "coverage": {
+      "plugins": ["istanbul"]
+    }
+  }
 }

.gitignore

@@ -1,3 +1,4 @@
 coverage
+.nyc_output
 node_modules
 lib

.npmignore

@@ -1,4 +1,5 @@
 coverage
+.nyc_output
 test
 node_modules
 .babelrc

README.md

@@ -10,8 +10,9 @@ This is my personal skeleton for creating an ES2015 library npm package.  You ar
 * babel 6
 * mocha
 * chai
-* isparta
 * istanbul
+* nyc
+* babel-plugin-istanbul
 * eslint
 * eslint-watch
 * flow

package.json

@@ -10,13 +10,23 @@
     "flow": "flow",
     "flow:watch": "flow-watch --ignore lib/ --ignore node_modules/ --watch .flowconfig --watch src/ --watch scripts/ --watch test/",
     "test": "mocha $npm_package_config_mocha",
-    "coverage": "babel-node ./node_modules/.bin/isparta cover --report lcov _mocha -- $npm_package_config_mocha",
+    "coverage": "NODE_ENV=coverage nyc --reporter=lcov --reporter=text mocha $npm_package_config_mocha",
     "prepublish": "npm run lint && flow && npm run coverage && rimraf lib && babel src --out-dir lib",
     "postpublish": "git tag -a v$npm_package_version -m v$npm_package_version && git push origin v$npm_package_version"
   },
   "config": {
     "mocha": "--compilers js:babel-core/register ./test/**/*.js"
   },
+  "nyc": {
+    "include": [
+      "src/**/*.js"
+    ],
+    "require": [
+      "babel-register"
+    ],
+    "sourceMap": false,
+    "instrument": false
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/jedwards1211/es2015-library-skeleton.git"
@@ -34,6 +44,7 @@
     "babel-cli": "^6.16.0",
     "babel-core": "^6.17.0",
     "babel-eslint": "^7.0.0",
+    "babel-plugin-istanbul": "^2.0.1",
     "babel-plugin-transform-runtime": "^6.15.0",
     "babel-preset-es2015": "^6.16.0",
     "babel-preset-flow": "^1.0.0",
@@ -46,9 +57,9 @@
     "eslint-watch": "^2.1.14",
     "flow-bin": "^0.33.0",
     "flow-watch": "^1.0.0",
-    "isparta": "^4.0.0",
     "istanbul": "^0.4.5",
     "mocha": "^3.1.0",
+    "nyc": "^8.3.0",
     "rimraf": "^2.5.4"
   },
   "dependencies": {}