update badges

README.md

@@ -1,7 +1,9 @@
 Screencat
-[![Build Status](https://travis-ci.org/jlindsey/screencat.svg?branch=master)](https://travis-ci.org/jlindsey/screencat)
 =========
 
+[![Github Release](https://img.shields.io/github/release/jlindsey/screencat.svg)](https://github.com/jlindsey/screencat/releases)
+[![Build Status](https://travis-ci.org/jlindsey/screencat.svg?branch=master)](https://travis-ci.org/jlindsey/screencat)
+
 Screenshot sharing tool using the excellent [Sendcat](https://sendcat.com/) service.o
 
 See the [releases](https://github.com/jlindsey/screencat/releases) page for pre-built binaries.
@@ -12,6 +14,9 @@ Requirements
 This tool requires at least Sendcat v0.0.10, or any later version with the `-j` flag
 for JSON output.
 
+If you are on macOS, you can install the [terminal-notifier](https://github.com/julienXX/terminal-notifier)
+tool to get desktop toast notifications when a screenshot is uploaded.
+
 Usage
 -----