Use nyc instead of isparta for coverage

Author: boopathi

.babelrc

@@ -3,10 +3,21 @@
     [
       "env",
       {
-        "targets": { "node": 4 }
+        "targets": {
+          "node": 4
+        }
       }
     ],
     "flow"
   ],
-  "plugins": ["add-module-exports"]
+  "plugins": [
+    "add-module-exports"
+  ],
+  "env": {
+    "test": {
+      "plugins": [
+        "istanbul"
+      ]
+    }
+  }
 }

.gitignore

@@ -3,4 +3,5 @@ npm-debug.log
 lib
 *.svg.react.js
 coverage
-.vscode
+.vscode
+.nyc_output

package.json

@@ -23,17 +23,18 @@
   "scripts": {
     "build": "gulp build",
     "clean": "rm -rf lib",
-    "cover": "babel-node `npm bin`/isparta cover test/index.js",
+    "cover": "NODE_ENV=test nyc --reporter=lcov yarn test",
     "eslint": "eslint .",
     "flow": "flow",
     "lint": "yarn flow && yarn eslint",
-    "test": "tape -r babel-register test/index.js | faucet",
+    "test": "NODE_ENV=test tape -r babel-register test/index.js | faucet",
     "watch": "gulp watch"
   },
   "devDependencies": {
     "babel-cli": "^6.24.1",
     "babel-eslint": "^8.0.1",
     "babel-plugin-add-module-exports": "^0.2.1",
+    "babel-plugin-istanbul": "^4.1.5",
     "babel-preset-env": "^1.6.0",
     "babel-preset-flow": "^6.23.0",
     "babel-register": "^6.24.1",
@@ -48,8 +49,8 @@
     "gulp-babel": "^7.0.0",
     "gulp-newer": "^1.3.0",
     "gulp-util": "^3.0.8",
-    "isparta": "^4.0.0",
     "lerna": "^2.4.0",
+    "nyc": "^11.2.1",
     "prettier": "^1.7.2",
     "react": "^16.0.0",
     "react-dom": "^16.0.0",