Bump to v3.0.0-rc.1

package.json

 {
   "name": "mirador",
-  "version": "3.0.0-beta.10",
+  "version": "3.0.0-rc.1",
   "description": "",
   "main": "dist/mirador.min.js",
   "module": "dist/es/src/index.js",