chore: Simplify test commands

Author: bebraw

package.json

@@ -7,9 +7,9 @@
     "build": "rimraf dist && babel src -d dist",
     "build:watch": "npm-watch",
     "test:all": "npm run test:coverage && npm run test:lint",
-    "test": "jest --",
-    "test:coverage": "jest --coverage --",
-    "test:watch": "jest --watch --",
+    "test": "jest",
+    "test:coverage": "jest --coverage",
+    "test:watch": "jest --watch",
     "test:lint": "eslint . --ext .js --ignore-path .gitignore --cache",
     "preversion": "npm run test:all && npm run build && git commit --allow-empty -am \"Update dist\"",
     "postinstall": "node lib/post_install.js"