fix program arguments not being passed to commands

config/command.go

@@ -15,8 +15,8 @@ type Command struct {
 }
 
 func (c Command) Execute(payload string, header http.Header) ([]byte, error) {
-	arguments := make([]string, 0)
-	copy(c.Arguments, arguments)
+	arguments := make([]string, len(c.Arguments))
+	copy(arguments, c.Arguments)
 
 	if c.AppendPayload {
 		arguments = append(arguments, payload)

readme.md

@@ -69,7 +69,8 @@ An example config file can be found [here](./config.json) but also below:
     "test": {
       "Script": {
           "Program": "./example.sh",
-          "AppendPayload": true
+          "AppendPayload": true,
+          "AppendHeaders": true
       },
       "DisableSignatureVerification": true,
       "Tests": [