build: run conformance test as part of npm test (#440)

Author: jkwlui

handwritten/firestore/package.json

@@ -36,7 +36,7 @@
     "samples-test": "npm link && cd samples/ && npm link ../ && npm test && cd ../",
     "conformance": "mocha build/conformance",
     "test-only": "nyc mocha build/test",
-    "test": "npm run test-only",
+    "test": "npm run test-only && npm run conformance",
     "lint": "gts check",
     "clean": "gts clean",
     "compile": "tsc -p . && cp -r dev/protos build && cp -r dev/test/fake-certificate.json build/test/fake-certificate.json  && cp dev/src/v1beta1/firestore_client_config.json build/src/v1beta1/ && cp dev/conformance/test-definition.proto build/conformance && cp dev/conformance/test-suite.binproto build/conformance",