Merge pull request #2495 from gaugau3000/prepare_reorg_install_doc

Prepare reorg install doc : explain differences between master and develop

docs/installation.md

@@ -34,10 +34,12 @@ Freqtrade provides a Linux/MacOS script to install all dependencies and help you
 ```bash
 git clone git@github.com:freqtrade/freqtrade.git
 cd freqtrade
-git checkout develop
 ./setup.sh --install
 ```
 
+!!! Note "Version considerations"
+    When cloning the repository the default working branch is name `develop`. This branch contains the last features (can be considered as relatively stable thanks to automated tests). The `master` branch contains the code of the last release (done once per month with a one week old snapshot of the `develop` branch to prevent packaging bugs so potentially more stable).
+
 !!! Note
     Windows installation is explained [here](#windows).