chore(release): publish [skip ci]

- @ohif/extension-vtk@1.1.6
 - @ohif/core@2.2.1
 - @ohif/viewer@3.2.1

platform/core/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ohif/core",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "Generic business logic for web-based medical imaging applications",
   "author": "OHIF Core Team",
   "license": "MIT",