Update installation and usage infomation

README.md

@@ -4,14 +4,19 @@ Simple command line utility to check the status of an SSL certificate.
 
 Basically, it attempts to establish a TLS connection to a server and reports back useful info about the cert's status.
 
-## Usage
+## Installation
+
+To install the utility, please [download the appropriate release](https://github.com/colinodell/go-check-ssl/releases), unarchive the files, and move the binary somewhere under your path.
+To upgrade, download the latest version and replace the binary with the new one.
 
-Either build it yourself or grab a pre-compiled download from the [Releases](https://github.com/colinodell/go-check-ssl/releases) page.
+On macOS, you can use homebrew: `brew install colinodell/tap/check-ssl`
+
+## Usage
 
 To check a certificate, simply run:
 
 ```bash
-./check-ssl [server]
+check-ssl [server]
 ```
 
 ![](screenshot.png)
@@ -26,7 +31,7 @@ Example of allowed arguments include:
 By default, it'll resolve the IP of the given domain and test against that server.  But you can also use this tool to check other servers by providing two arguments: the server to test and the SNI to use.  For example:
 
 ```bash
-./check-ssl [server] --sni=[SNI domain]
+check-ssl [server] --sni=[SNI domain]
 
-./check-ssl example.com --sni=foo.example.com
+check-ssl example.com --sni=foo.example.com
 ```