chore: merge from master

Author: felipelube

README.md

@@ -1,7 +1,7 @@
 # NPM Script Webhook
 Tiny web app for executing a npm task after a successful token authentication request.
 
-The request need to be sent via POST in the following format:
+The request body need to be sent via POST in the following format:
 ```json
 {
   "secret": "51999777-c86a-41c0-b69f-2e3f9ccc0f3b"
@@ -17,6 +17,12 @@ The following ENV vars are used to configure the app:
 ## Responses
 The possible responses are:
 - HTTP 204: task execution was successful, the output is logged to `stdout`.
+- HTTP 400: invalid request.
 - HTTP 403: invalid request or failed token authentication.
 - HTTP 405: only http `POST` method is allowed.
 - HTTP 500: task execution incurred in errors, traceback is logged to `stderr`.
+
+## Docker hub images
+- felubra/npm-script-webhook:latest: based on mhart/alpine-node:12
+- felubra/npm-script-webhook:slim: based on node:12-slim
+- felubra/npm-script-webhook:standard: based on node:12