Fix #61 by correctly referencing PLUGIN_FROM.ADDRESS and PLUGIN_FROM.NAME

README.md

@@ -42,8 +42,8 @@ Execute from the working directory:
 
 ```sh
 docker run --rm \
-  -e PLUGIN_FROM_ADDRESS=drone@test.test \
-  -e PLUGIN_FROM_NAME="John Smith" \
+  -e PLUGIN_FROM.ADDRESS=drone@test.test \
+  -e PLUGIN_FROM.NAME="John Smith" \
   -e PLUGIN_HOST=smtp.test.test \
   -e PLUGIN_USERNAME=drone \
   -e PLUGIN_PASSWORD=test \

main.go

@@ -33,12 +33,12 @@ func main() {
 		cli.StringFlag{
 			Name:   "from.address",
 			Usage:  "from address",
-			EnvVar: "PLUGIN_FROM_ADDRESS",
+			EnvVar: "PLUGIN_FROM.ADDRESS",
 		},
 		cli.StringFlag{
 			Name:   "from.name",
 			Usage:  "from name",
-			EnvVar: "PLUGIN_FROM_NAME",
+			EnvVar: "PLUGIN_FROM.NAME",
 		},
 		cli.StringFlag{
 			Name:   "host",