message: Manually specify runtime options
diff: @@ -63,7 +63,24 @@ export interface FunctionProps
  *
  * @default - Defaults to NODEJS_12_X
  */
  - readonly runtime?: string | lambda.Runtime;
  + readonly runtime?:
  + | "nodejs"
  + | "nodejs4.3"
  + | "nodejs6.10"
  + | "nodejs8.10"
  + | "nodejs10.x"
  + | "nodejs12.x"
  + | "nodejs14.x"
  + | "python2.7"
  + | "python3.6"
  + | "python3.7"
  + | "python3.8"
  + | "dotnetcore1.0"
  + | "dotnetcore2.0"
  + | "dotnetcore2.1"
  + | "dotnetcore3.1"
  + | "go1.x"
  + | lambda.Runtime;
  /**
  * The amount of memory in MB allocated.
  *
  