chore(release): publish [skip ci]

- @ohif/extension-cornerstone@2.7.0
 - @ohif/extension-dicom-html@1.2.0
 - @ohif/extension-dicom-rt@0.1.0
 - @ohif/extension-dicom-segmentation@0.2.0
 - @ohif/extension-vtk@1.5.0
 - @ohif/core@2.9.0
 - @ohif/viewer@3.11.0

platform/core/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ohif/core",
-  "version": "2.8.1",
+  "version": "2.9.0",
   "description": "Generic business logic for web-based medical imaging applications",
   "author": "OHIF Core Team",
   "license": "MIT",