Suggested improvement for beginner documentation

This is a proposed fix for #5443

Without git installed `npx degit sveltejs/template my-svelte-project` results in 
```
npx: installed 1 in 0.839s
! could not fetch remote https://github.com/sveltejs/template
! could not find commit hash for master
```
From a newbie perspective it isn't immediately obvious that git is required.

I've updated this post to make that more clear.

site/content/blog/2019-04-16-svelte-for-new-developers.md

@@ -58,7 +58,7 @@ To write code, you need a good editor. The most popular choice is [Visual Studio
 
 We're going to follow the instructions in part two of [The easiest way to get started with Svelte](/blog/the-easiest-way-to-get-started).
 
-First, we'll use npx to run [degit](https://github.com/Rich-Harris/degit), a program for cloning project templates from [GitHub](https://github.com) and other code storage websites. You don't have to use a project template, but it means you have to do a lot less setup work.
+First, we'll use npx to run [degit](https://github.com/Rich-Harris/degit), a program for cloning project templates from [GitHub](https://github.com) and other code storage websites. You don't have to use a project template, but it means you have to do a lot less setup work.  You will need to have [git](https://git-scm.com/) installed in order to use degit.  
 
 (Eventually you'll probably have to learn [git](https://git-scm.com/), which most programmers use to manage their projects. But you don't need to worry about it just yet.)