Add a caveat
Add a caveat

Add a caveat about update-exim4.conf that bit someone during the
installfest at AlaveteliCon.

hasadna/alaveteli,andreicristianpetcu/alaveteli,4bic/alaveteli,Br3nda/alaveteli,andreicristianpetcu/alaveteli_old,10layer/alaveteli,TEDICpy/QueremoSaber,obshtestvo/alaveteli-bulgaria,nzherald/alaveteli,nzherald/alaveteli,datauy/alaveteli,hasadna/alaveteli,TEDICpy/QueremoSaber,andreicristianpetcu/alaveteli_old,obshtestvo/alaveteli-bulgaria,4bic/alaveteli,TEDICpy/QueremoSaber,hasadna/alaveteli,codeforcroatia/alaveteli,datauy/alaveteli,TEDICpy/QueremoSaber,hasadna/alaveteli,codeforcroatia/alaveteli,codeforcroatia/alaveteli,hasadna/alaveteli,datauy/alaveteli,sarhane/alaveteli-test,andreicristianpetcu/alaveteli_old,andreicristianpetcu/alaveteli_old,andreicristianpetcu/alaveteli_old,nzherald/alaveteli,Br3nda/alaveteli,nzherald/alaveteli,petterreinholdtsen/alaveteli,4bic/alaveteli,Br3nda/alaveteli,petterreinholdtsen/alaveteli,andreicristianpetcu/alaveteli,codeforcroatia/alaveteli,sarhane/alaveteli-test,petterreinholdtsen/alaveteli,nzherald/alaveteli,TEDICpy/QueremoSaber,Br3nda/alaveteli,petterreinholdtsen/alaveteli,obshtestvo/alaveteli-bulgaria,petterreinholdtsen/alaveteli,Br3nda/alaveteli,4bic/alaveteli,andreicristianpetcu/alaveteli,obshtestvo/alaveteli-bulgaria,4bic/alaveteli,hasadna/alaveteli,sarhane/alaveteli-test,sarhane/alaveteli-test,andreicristianpetcu/alaveteli,10layer/alaveteli,10layer/alaveteli,obshtestvo/alaveteli-bulgaria,andreicristianpetcu/alaveteli