Move @oclif/plugin-help from devDependencies to dependencies

Author: Tim Mendoza

package.json

@@ -19,13 +19,13 @@
   "dependencies": {
     "@oclif/command": "^1.5.19",
     "@oclif/config": "^1.14.0",
+    "@oclif/plugin-help": "^2",
     "@twilio-labs/serverless-api": "^1.0.3",
     "@twilio/cli-core": "^4.4.6",
     "moment": "^2.24.0"
   },
   "devDependencies": {
     "@oclif/dev-cli": "^1",
-    "@oclif/plugin-help": "^2",
     "@oclif/test": "^1",
     "@types/jest": "^25.1.3",
     "chai": "^4.2.0",