update default values for description and license in readme (#14)

update default values for description and license in readme

Author: asahasrabuddhe

README.md

@@ -36,8 +36,8 @@ GLOBAL OPTIONS:
    --output-directory value, -o value  Destination directory for command output (default: "./output")
    --layer-namespace value, -n value   Prefix for the layers published to Lambda (default: "img2lambda")
    --dry-run, -d                       Conduct a dry-run: Repackage the image, but only write the Lambda layers to local disk (do not publish to Lambda)
-   --description value, --desc value   The description of this layer version
-   --license-info value, -l value      The layer's software license. It can be an SPDX license identifier, the URL of the license hosted on the internet, or the full text of the license
+   --description value, --desc value   The description of this layer version (default: "created by img2lambda from image <name of the image>")
+   --license-info value, -l value      The layer's software license. It can be an SPDX license identifier, the URL of the license hosted on the internet, or the full text of the license (default: no license)
 
    --help, -h                          show help
 ```

img2lambda/cli/main.go

@@ -58,12 +58,12 @@ func createApp() (*cli.App, *types.CmdOptions) {
 		},
 		cli.StringFlag{
 			Name:        "description, desc",
-			Usage:       "The description of this layer version",
+			Usage:       "The description of this layer version (default: \"created by img2lambda from image <name of the image>\")",
 			Destination: &opts.Description,
 		},
 		cli.StringFlag{
 			Name:        "license-info, l",
-			Usage:       "The layer's software license. It can be an SPDX license identifier, the URL of the license hosted on the internet, or the full text of the license",
+			Usage:       "The layer's software license. It can be an SPDX license identifier, the URL of the license hosted on the internet, or the full text of the license (default: \"no license\"",
 			Destination: &opts.LicenseInfo,
 		},
 	}