Fix HMR for Pug assets (#2091)

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name: 🙋 Fix HMR for Pug assets
---

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## ↪️ Pull Request
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#2090

## 💻 Examples

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## ✔️ PR Todo

- [ ] Added/updated unit tests for this change
- [ ] Filled out test instructions
- [x] Included links to related issues/PRs
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packages/core/parcel/src/assets/PugAsset.js

@@ -6,6 +6,7 @@ class PugAsset extends Asset {
   constructor(name, options) {
     super(name, options);
     this.type = 'html';
+    this.hmrPageReload = true;
   }
 
   async generate() {