bump versions to same starting point (still pre-v1)

extensions/cornerstone/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ohif/extension-cornerstone",
-  "version": "0.0.39-alpha.9",
+  "version": "0.50.0-alpha.9",
   "description": "OHIF extension for Cornerstone",
   "author": "OHIF",
   "license": "MIT",
@@ -27,8 +27,8 @@
     "start": "yarn run dev"
   },
   "peerDependencies": {
-    "@ohif/core": "^0.11.1-alpha.0",
-    "@ohif/ui": "^0.2.18-alpha.0",
+    "@ohif/core": "^0.50.0-alpha.0",
+    "@ohif/ui": "^0.50.0-alpha.0",
     "cornerstone-core": "^2.2.8",
     "cornerstone-math": "^0.1.8",
     "cornerstone-tools": "^3.1.0",