update readme

Author: omonk

Diff for: README.md

@@ -347,7 +347,9 @@ The additional webpack config will be merged into the default config via [webpac
 
 The default webpack configuration uses `babel-loader` with a [few basic settings](https://github.com/netlify/netlify-lambda/blob/master/lib/build.js#L19-L33).
 
-However, if any `.babelrc` is found in the directory `netlify-lambda` is run from, or [folders above it](https://github.com/netlify/netlify-lambda/pull/92) (useful for monorepos), it will be used instead of the default one.
+However, if any `.babelrc` is found in the directory `netlify-lambda` is run from, or [folders above it](https://github.com/netlify/netlify-lambda/pull/92) (useful for monorepos), it will be used instead of the default one. 
+
+It is possible to disable this behaviour by passing `--babelrc false`.  
 
 If you need to run different babel versions for your lambda and for your app, [check this issue](https://github.com/netlify/netlify-lambda/issues/34) to override your webpack babel-loader.
 
@@ -393,6 +395,7 @@ There are additional CLI options:
 -p --port
 -s --static
 -t --timeout
+-b --babelrc
 ```
 
 ### --config option
@@ -422,6 +425,12 @@ The serving port can be changed with the `-p`/`--port` option.
 
 If you need an escape hatch and are building your lambda in some way that is incompatible with our build process, you can skip the build with the `-s` or `--static` flag. [More info here](https://github.com/netlify/netlify-lambda/pull/62).
 
+### --babelrc
+
+Defaults to `true`
+
+Use a `.babelrc` found in the directory `netlify-lambda` is run from. This can be useful when you have conflicting babel-presets, more info [here](#babel-configuration)
+
 ## Netlify Identity
 
 Make sure to [read the docs](https://www.netlify.com/docs/functions/#identity-and-functions) on how Netlify Functions and Netlify Identity work together. Basically you have to make your request with an `authorization` header and a `Bearer` token with your Netlify Identity JWT supplied. You can get this JWT from any of our Identity solutions from [gotrue-js](https://github.com/netlify/gotrue-js) to [netlify-identity-widget](https://github.com/netlify/netlify-identity-widget).

Diff for: bin/cmd.js

@@ -26,7 +26,7 @@ const stringBooleanToBoolean = val => {
 program
   .option("-c --config <webpack-config>", "additional webpack configuration")
   .option("-p --port <port>", "port to serve from (default: 9000)")
-  .option("-b --babelrc <no-babelrc>", "use .babelrc in root (default: true)", stringBooleanToBoolean)
+  .option("-b --babelrc babelrc>", "use .babelrc in root (default: true)", stringBooleanToBoolean)
   .option(
     "-t --timeout <timeout>",
     "function invocation timeout in seconds (default: 10)"