add a link to README answering common question

Signed-off-by: Dustin DeWeese <dustin.deweese@gmail.com>
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Dustin DeWeese 2020-01-13 11:24:31 -08:00 committed by Dusty DeWeese
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@ -29,6 +29,10 @@ that shell. The Vivado wrapper utils/vivado.sh makes sure that the environment
variables from XRAY_VIVADO_SETTINGS are automatically sourced in a separate
shell that is then only used to run Vivado to avoid these problems.
**Why 2017.2?** Currently the fuzzers only work on `2017.2`, see [Issue #14 on prjxray](https://github.com/SymbiFlow/prjxray/issues/14).
**Is 2017.2 really required?** Yes, only `2017.2` works. Until Issue #14 is solved, **only** `2017.2` works and will be supported.
### Step 2: ###
Pull submodules: