Merge pull request sleepypioneer#2 from sleepypioneer/macos-setup-fix

Add version clarification and submodule step to macOS instructions

setupGuides/NextcloudMacDevelopmentEnvironment.md

@@ -1,8 +1,10 @@
 # Nextcloud development environment on macOS
 
-1. **Install dependencies:** Get php71 and sqlite via [Homebrew](https://brew.sh/). (This step is not necessary on new versions of macOS since it already comes with PHP 7.)
+(If you use macOS 10.12 Sierra or earlier, you also need to install dependencies: Get php71 and sqlite via [Homebrew](https://brew.sh/).)
 
-2. **Get the Nextcloud code:** Either using [Github Desktop](https://desktop.github.com/) (or using the Terminal if you prefer that), clone the Nextcloud server repository https://github.com/nextcloud/server
+1. **Get the Nextcloud code:** Either using [Github Desktop](https://desktop.github.com/) (or using the Terminal if you prefer that), clone the Nextcloud server repository https://github.com/nextcloud/server
+
+2. **Get Nextcloud submodules:** Using the Terminal, run this command in the nextcloud folder you just cloned: `git submodule update --init`
 
 3. **Start the server:** In the Terminal, run the command: `php -S localhost:8000`