remove version script

package.json

@@ -35,7 +35,6 @@
     "app:server": "yarn lerna run server --scope @growi/app",
     "slackbot-proxy:build": "yarn lerna run build --scope @growi/slackbot-proxy --scope @growi/slack",
     "slackbot-proxy:server": "yarn lerna run start:prod --scope @growi/slackbot-proxy",
-    "version": "node -p \"require('./package.json').version\"",
     "//// scripts for backward compatibility": "",
     "build:prod": "echo !!! CAUTION !!! ==> The script 'build:prod' is deprecated. Use 'yarn app:build' instead. && yarn app:build",
     "server:prod": "echo !!! CAUTION !!! ==> The script 'server:prod' is deprecated. Use 'yarn app:build' instead. && yarn app:server"

packages/slackbot-proxy/package.json

@@ -19,7 +19,6 @@
     "test": "cross-env NODE_ENV=test jest --passWithNoTests",
     "lint": "eslint src --ext .ts",
     "lint:fix": "eslint src --ext .ts --fix",
-    "version": "node -p \"require('./package.json').version\""
   },
   "// comments for dependencies": {},
   "dependencies": {