chore(readme): update supported nodejs runtime (#2)

Author: ops-gaurav

README.md

@@ -53,7 +53,7 @@ Replace the placeholders with the appropriate values:
 - `layer_name`: Name of the layer where you want to publish this version. This layer name must already exist on AWS Lambda layers.`access_key_id` and `secret_access_key` must be allowed to interact with this layer.<br/>
 - `archive`: Refers the path of the zip archive to upload as layer. The archive creation process is not part of this action since the build steps may vary from application to application and it should be taken care as a separate step. Refer below for a quick example to how to do this for a NodeJS application.<br/>
 - `architectures`: String containing array of architectures that this new layer will support. Valid values are `[x_86_64 || arm64]`.<br/>
-- `runtimes`: The list of valid runtimes that this layer can support. The valid values are `["nodejs" || "nodejs4.3" || "nodejs6.10" || "nodejs8.10" || "nodejs10.x" || "nodejs12.x" || "nodejs14.x" || "nodejs16.x" || "java8" || "java8.al2" || "java11" || "python2.7" || "python3.6" || "python3.7" || "python3.8" || "python3.9" || "dotnetcore1.0" || "dotnetcore2.0" || "dotnetcore2.1" || "dotnetcore3.1" || "dotnet6" || "nodejs4.3-edge" || "go1.x" || "ruby2.5" || "ruby2.7" || "provided" || "provided.al2" || "nodejs18.x" || "python3.10" || "java17" || "ruby3.2" || "python3.11"]`<br/>
+- `runtimes`: The list of valid runtimes that this layer can support. The valid values are `["nodejs" || "nodejs4.3" || "nodejs6.10" || "nodejs8.10" || "nodejs10.x" || "nodejs12.x" || "nodejs14.x" || "nodejs16.x" || "nodejs18.x"|| "nodejs20.x" || "java8" || "java8.al2" || "java11" || "python2.7" || "python3.6" || "python3.7" || "python3.8" || "python3.9" || "dotnetcore1.0" || "dotnetcore2.0" || "dotnetcore2.1" || "dotnetcore3.1" || "dotnet6" || "nodejs4.3-edge" || "go1.x" || "ruby2.5" || "ruby2.7" || "provided" || "provided.al2" || "nodejs18.x" || "python3.10" || "java17" || "ruby3.2" || "python3.11"]`<br/>
 - `s3_bucket`: An optional parameter for S3 Bucket Name In case if layer exceeds the allocated threshold size. We recommend to always provide with this value since if this value is present then action will try to upload layer via S3 automatically as failsafe mechanism for larger layers. Overcoming the limitation of direct AWS Lambda Layer size constraints over SDK.
 - `functions`: An Optional array of functions to refresh the layer to the latest uploaded version. It is recommended to pass down all the functions in this argument that uses this layer. Action will try to refresh all the dependent functions to use the latest layer version automatically.
 
@@ -109,4 +109,4 @@ Contributions to this project are welcome. If you find any issues or want to add
 
 By using this custom GitHub Action, you can simplify the release process of your AWS Lambda layers, automate the handling of larger layers, and ensure all dependent Lambda functions are updated with the latest layer version. Happy coding!
 
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