ci(travis): Add bundlesize test.

Author: Jay Freestone

.travis.yml

@@ -9,6 +9,8 @@ jobs:
     - stage: test
       before_script: npm run build
       script: npm run test:ci
+    - before_script: npm run build
+      script: npm run bundlesize
     - stage: release
       before_script: npm run build
       script: skip

package.json

@@ -42,5 +42,11 @@
     "typescript": "^3.3.3333",
     "wait-on": "^3.2.0",
     "webpack": "^4.33.0"
-  }
+  },
+  "bundlesize": [
+    {
+      "path": "./dist/priority-plus.*.js",
+      "maxSize": "2.5 kB"
+    }
+  ]
 }