Add statusline option

Fixes #105

cmd/micro/settings.go

@@ -78,6 +78,7 @@ func DefaultSettings() map[string]interface{} {
 		"syntax":       true,
 		"tabsToSpaces": false,
 		"ruler":        true,
+		"statusline":   true,
 	}
 }
 
@@ -117,6 +118,10 @@ func SetOption(view *View, args []string) {
 			view.Buf.UpdateRules()
 		}
 
+		if option == "statusline" {
+			view.Resize(screen.Size())
+		}
+
 		err := WriteSettings(filename)
 		if err != nil {
 			messenger.Error("Error writing to settings.json: " + err.Error())