added changelog 0.1.8

changelogs/0.1.8.md

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+# Whats up in Jellyplist 0.1.8?
+Not much this time, just some small fixes and one enhancement.
+
+### 🆕Jellyplist now checks for updates
+Jellyplist now checks the GitHub releases for new version. 
+If a new version is available, you will notice the small badge on the lower left will pulsate slighty, so you don´t miss any new release :smile:
+
+If you don´t like that Jellyplist is doing this, you can opt out by setting this env var in your `.env` file
+```bash
+CHECK_FOR_UPDATES = false
+```
+
+### Other changes, improvements and fixes
+- Fix for #30 , where the output path for spotDL wasn´t created correctly
+