README: Update how to use DEBUG variable

Update osbuilder README to use DEBUG
environment variable for executing scripts in
debug mode.

Fixes:  #368

Signed-off-by: Nitesh Konkar <niteshkonkar@in.ibm.com>
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nitkon 2019-09-28 23:12:20 +05:30 committed by GitHub
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@ -68,6 +68,7 @@ This section describes the terms used for all documentation in this repository.
## Building
The top-level `Makefile` contains an example of how to use the available components.
Set `DEBUG=true` to execute build scripts in debug mode.
Two build methods are available, `distro` and `dracut`.
By default, the `distro` build method is used, and this creates a rootfs using