chore: add the build script to the pretest script. (#539)

This small change allows a developer to just run npm install and then npm test without having to run the build step separately, which compiles the schema that is needed to run the tests successfully.

Signed-off-by: Lucas Holmquist <lholmqui@redhat.com>

Author: lholmquist

Diff for: package-lock.json

@@ -13,7 +13,7 @@
     "lint:js": "eslint 'src/**/*.{js,ts}' 'test/**/*.{js,ts}' cucumber.js",
     "lint:md": "remark .",
     "lint:fix": "eslint 'src/**/*.{js,ts}' 'test/**/*.{js,ts}' --fix",
-    "pretest": "npm run lint && npm run conformance",
+    "pretest": "npm run lint && npm run build && npm run conformance",
     "test": "mocha --require ts-node/register ./test/integration/**/*.ts",
     "test:one": "mocha --require ts-node/register",
     "conformance": "cucumber-js ./conformance/features/*-protocol-binding.feature -p default",