docs: add go install method of install

Signed-off-by: Matt Gleich <[email protected]>

README.md

@@ -44,12 +44,18 @@ brew install rootlyhq/homebrew-tap/rootly
 
 #### 🐧 Linux and 🖥️ Windows
 
-You can grab the binary from the [latest release](https://github.com/rootlyhq/cli/releases/latest) or run the following shell script:
+You can grab the binary from the [latest release](https://github.com/rootlyhq/cli/releases/latest) or run the command below.
 
 ```bash
 curl -fsSL https://raw.githubusercontent.com/rootlyhq/cli/main/install.sh | sh
 ```
 
+If you have golang installed you can also just install the binary using the following command. Keep in mind that this will go in `~/go/bin/` by default which might not be in your path.
+
+```bash
+go install github.com/rootlyhq/cli@latest
+```
+
 ## 📟 Commands
 
 ### ℹ️ `rootly pulse`