Refreshing size after population
**Which version of the plugin are you using?**
[x ] Data Populator for Sketch
[ ] Data Populator for Adobe XD

**Describe the bug**
After populationg my symbols, which uses smart layout in Sketch, they don't resize if there is more data (text) than designed in the original symbol.

**To Reproduce**
Steps to reproduce the behavior:
1. Populate symbol made with smart layout and one text line and baclground via JSON-Data which fillst two text lines
2. See how the symbol isn't updating its size

**Expected behavior**
Symbols should be "refreshed" after populating

**Environment (please complete the following information):**
 - macOS Version: [Catalina 10.15.2]
 - Sketch Version [61.2]
 - Plugin Version [3.0.3]

