Fixed #21, change isparta to nyc

Author: Ivan Demidov

Diff for: .gitignore

@@ -1,5 +1,6 @@
 node_modules/
 lib/
 coverage/
+.nyc_output/
 npm-debug.log
 *.sublime*

Diff for: package.json

@@ -8,7 +8,7 @@
     "clean": "rm -rf lib && mkdir lib",
     "build": "npm run clean && babel --presets node5 src/index.js --out-file lib/index.js",
     "prepublish": "npm run build",
-    "coverage": "babel-node ./node_modules/isparta/bin/isparta cover --report text node_modules/mocha/bin/_mocha --",
+    "coverage": "nyc node_modules/mocha/bin/_mocha --compilers js:babel-register",
     "coveralls": "coveralls < coverage/lcov.info",
     "precoveralls": "npm run coverage",
     "update": "updtr"
@@ -43,8 +43,8 @@
     "babel-register": "^6.7.2",
     "chai": "^3.5.0",
     "coveralls": "^2.11.8",
-    "isparta": "^4.0.0",
     "mocha": "^2.4.5",
+    "nyc": "^6.1.1",
     "updtr": "^0.1.7",
     "xo": "^0.13.0"
   },