message: Add missing step for submodule init & update
  Change-type: patch
  Changelog-entry: Add missing step for submodule cloning in README
diff: @@ -64,7 +64,7 @@ which can be installed by running `xcode-select --install`.
  ### Cloning the project
  ```sh
  -git clone https://github.com/balena-io/etcher
  +git clone --recursive https://github.com/balena-io/etcher
  cd etcher
  ```
  