Update collections.json (#173)

* Update collections.json

adds Mach1 Spatial System plugin collection

* Add Mach1 Spatial System to collections.json

---------

Co-authored-by: Christopher Cook <[email protected]>

Author: himwho

data/collections.json

@@ -19,6 +19,11 @@
     "url": "https://linuxsynths.com/",
     "description": "list of linux based synths, many of which are open-source"
   },
+  {
+    "name": "Mach1 Spatial System",
+    "url": "https://github.com/mach1studios/m1-spatialsystem",
+    "description": "foundational plugins for spatial and multichannel audio mixing focused around vector panning"
+  },
   {
     "name": "Open Audio Stack",
     "url": "https://github.com/open-audio-stack",