enforce test coverage check in .taprc (#659)

Author: Uzlopak

.taprc

@@ -1,6 +1,2 @@
-100: true
-ts: false
-jsx: false
-flow: false
-coverage: true
-check-coverage: true
+files:
+  - test/**/*.js

package.json

@@ -13,7 +13,7 @@
     "test": "npm run prepare && npm run coverage && npm run typescript",
     "test:dev": "npm run lint && npm run unit && npm run typescript",
     "typescript": "tsd",
-    "unit": "tap -J \"test/**/*.js\"",
+    "unit": "tap",
     "unit:report": "npm run unit -- --coverage-report=html",
     "unit:verbose": "npm run unit -- -Rspec"
   },