chore: Update website for grain-v0.5.9

Author: grainbot

src/getting_grain.md

@@ -22,30 +22,30 @@ _The `--no-quarantine` flag will avoid having to approve the binary in the Secur
 
 ### MacOS x64 - Download
 
-If you'd prefer not to use homebrew, you can [download it](https://github.com/grain-lang/grain/releases/download/grain-v0.5.8/grain-mac-x64) directly from GitHub or using `curl`.
+If you'd prefer not to use homebrew, you can [download it](https://github.com/grain-lang/grain/releases/download/grain-v0.5.9/grain-mac-x64) directly from GitHub or using `curl`.
 
 ```sh
 sudo curl -L --output /usr/local/bin/grain \
-https://github.com/grain-lang/grain/releases/download/grain-v0.5.8/grain-mac-x64 \
+https://github.com/grain-lang/grain/releases/download/grain-v0.5.9/grain-mac-x64 \
 && sudo chmod +x /usr/local/bin/grain
 ```
 
 ### Linux x64 - Download
 
-You can [download it](https://github.com/grain-lang/grain/releases/download/grain-v0.5.8/grain-linux-x64) directly from GitHub or using `curl`.
+You can [download it](https://github.com/grain-lang/grain/releases/download/grain-v0.5.9/grain-linux-x64) directly from GitHub or using `curl`.
 
 ```sh
 sudo curl -L --output /usr/local/bin/grain \
-https://github.com/grain-lang/grain/releases/download/grain-v0.5.8/grain-linux-x64 \
+https://github.com/grain-lang/grain/releases/download/grain-v0.5.9/grain-linux-x64 \
 && sudo chmod +x /usr/local/bin/grain
 ```
 
 ### Windows x64 - Download
 
-You can [download it](https://github.com/grain-lang/grain/releases/download/grain-v0.5.8/grain-win-x64.exe) directly from GitHub or using `curl`.
+You can [download it](https://github.com/grain-lang/grain/releases/download/grain-v0.5.9/grain-win-x64.exe) directly from GitHub or using `curl`.
 
 ```batch
-curl -LO https://github.com/grain-lang/grain/releases/download/grain-v0.5.8/grain-win-x64.exe
+curl -LO https://github.com/grain-lang/grain/releases/download/grain-v0.5.9/grain-win-x64.exe
 ```
 
 You'll either want to put it into your path or keep it inside your project and invoke with `.\grain-win-x64.exe`.