[Dev Deps] switch from covert to nyc

.gitignore

@@ -2,6 +2,9 @@
 
 node_modules
 
+coverage/
+.nyc_output/
+
 # Only apps should have lockfiles
 npm-shrinkwrap.json
 package-lock.json

.nycrc

@@ -0,0 +1,14 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"lines": 86,
+	"statements": 85.93,
+	"functions": 82.43,
+	"branches": 76.06,
+	"exclude": [
+		"coverage",
+		"example",
+		"test"
+	]
+}

package.json

@@ -4,14 +4,13 @@
   "description": "parse argument options",
   "main": "index.js",
   "devDependencies": {
-    "covert": "^1.1.1",
     "npmignore": "^0.3.0",
+    "nyc": "^10.3.2",
     "tape": "^5.6.1"
   },
   "scripts": {
     "prepack": "npmignore --auto --commentLines=auto",
-    "test": "tape test/*.js",
-    "coverage": "covert test/*.js"
+    "test": "nyc tape test/*.js"
   },
   "testling": {
     "files": "test/*.js",