added cli usage info, removed useless type alias

README.md

@@ -115,6 +115,10 @@ To make a custom colorscheme, check out the [template](./colorschemes/template.g
 `-b`, `--battery` Show battery level widget (`minimal` turns off). [preview](./assets/screenshots/battery.png)  
 `-i`, `--interface=NAME` Select network interface [default: all].
 
+Several interfaces can be defined using comma separated values.
+
+Interfaces can also be ignored using `!`
+
 ## Built With
 
 - [gizak/termui](https://github.com/gizak/termui)

main.go

@@ -78,6 +78,10 @@ Options:
   -b, --battery         Show battery level widget ('minimal' turns off).
   -i, --interface=NAME  Select network interface [default: all].
 
+Several interfaces can be defined using comma separated values.
+
+Interfaces can also be ignored using !
+
 Colorschemes:
   default
   default-dark (for white background)

src/widgets/net.go

@@ -17,8 +17,6 @@ const (
 	NET_INTERFACE_VPN = "tun0"
 )
 
-type NetInterface string
-
 type NetWidget struct {
 	*ui.SparklineGroup
 	updateInterval time.Duration