Remove oclif readme when from npm prepack

Author: Yukaii

package.json

@@ -69,7 +69,7 @@
   "scripts": {
     "postpack": "rm -f oclif.manifest.json",
     "posttest": "tslint -p test -t stylish",
-    "prepack": "rm -rf lib && tsc -b && oclif-dev manifest && oclif-dev readme",
+    "prepack": "rm -rf lib && tsc -b && oclif-dev manifest",
     "test": "nyc --extension .ts mocha --forbid-only \"test/**/*.test.ts\"",
     "version": "oclif-dev readme && git add README.md"
   },