ci: update release configuration for prerelease management (#86)

Author: Le-Caignec

.release-please-manifest.json

@@ -2,7 +2,11 @@
   "packages": {
     ".": {
       "release-type": "simple",
-      "changelog-path": "CHANGELOG.md"
+      "changelog-path": "CHANGELOG.md",
+      "include-v-in-tag": true,
+      "prerelease": true,
+      "prerelease-type": "rc",
+      "versioning": "prerelease"
     }
   },
   "changelog-sections": [