Old Ubuntu: Use up-to-date version of golang (#216)

Currently, the install recommends using an out-of-date version of golang, which in turn causes issues while installing powerline-go.
MicrosoftDocs · Jan 30, 2021 · 737c169 · 737c169
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diff --git a/TerminalDocs/tutorials/powerline-setup.md b/TerminalDocs/tutorials/powerline-setup.md
@@ -102,6 +102,13 @@ sudo apt install golang-go
 go get -u github.com/justjanne/powerline-go
 ```
 
+> [!TIP]
+> If you're using Ubuntu 18.04 or 16.04, you'll need to first install the correct version of golang:
+> ```bash
+> sudo add-apt-repository ppa:longsleep/golang-backports
+> sudo apt update
+> ```
+
 ### Customize your Ubuntu prompt
 
 Open your `~/.bashrc` file with `nano ~/.bashrc` or the text editor of your choice. This is a bash script that runs every time bash starts. Add the following, though beware that GOPATH may already exist: