[Tests] run nyc on all tests

.nycrc

@@ -0,0 +1,13 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"lines": 86,
+	"statements": 85.93,
+	"functions": 82.43,
+	"branches": 76.06,
+	"exclude": [
+		"coverage",
+		"test"
+	]
+}

package.json

@@ -24,9 +24,8 @@
 		"pretest": "npm run lint && evalmd README.md",
 		"test": "npm run tests-only",
 		"posttest": "npx aud --production",
-		"tests-only": "tape 'test/**/*.js'",
+		"tests-only": "nyc tape 'test/**/*.js'",
 		"testling": "testling --html > test.html",
-		"coverage": "covert test/*.js",
 		"lint": "eslint .",
 		"postlint": "es-shim-api --bound",
 		"version": "auto-changelog && git add CHANGELOG.md",
@@ -57,13 +56,13 @@
 		"@ljharb/eslint-config": "^16.0.0",
 		"aud": "^1.1.0",
 		"auto-changelog": "^2.0.0",
-		"covert": "^1.1.1",
 		"eslint": "^6.8.0",
 		"evalmd": "^0.0.19",
 		"foreach": "^2.0.5",
 		"functions-have-names": "^1.2.1",
 		"has-strict-mode": "^1.0.0",
 		"indexof": "^0.0.1",
+		"nyc": "^10.3.2",
 		"safe-publish-latest": "^1.1.4",
 		"tape": "^5.0.0-next.5"
 	},