test: enable --throw-deprecation for tests (#625)

Author: JustinBeckwith

package.json

@@ -17,7 +17,7 @@
   "scripts": {
     "build": "cross-env BABEL_ENV=rollup rollup -c",
     "prepare": "npm run build",
-    "test": "cross-env BABEL_ENV=test mocha --require babel-register test/test.js",
+    "test": "cross-env BABEL_ENV=test mocha --require babel-register --throw-deprecation test/test.js",
     "report": "cross-env BABEL_ENV=coverage nyc --reporter lcov --reporter text mocha -R spec test/test.js",
     "coverage": "cross-env BABEL_ENV=coverage nyc --reporter json --reporter text mocha -R spec test/test.js && codecov -f coverage/coverage-final.json"
   },