sdutil: Fix exec usage in README
sdutil: Fix exec usage in README

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>

GrimDerp/flynn,philiplb/flynn,justintung/flynn,GrimDerp/flynn,felixrieseberg/flynn,TribeMedia/flynn,kgrz/flynn,benbjohnson/flynn,TribeMedia/flynn,benbjohnson/flynn,arekkas/flynn,Brandywine2161/flynn,TribeMedia/flynn,TribeMedia/flynn,shads196770/flynn,schatt/flynn,rikur/flynn,arekkas/flynn,kgrz/flynn,supermario/flynn,TribeMedia/flynn,supermario/flynn,whouses/flynn,shads196770/flynn,josephglanville/flynn,flynn/flynn,clifff/flynn,philiplb/flynn,tonicbupt/flynn,technosophos/flynn,arekkas/flynn,tonicbupt/flynn,josephglanville/flynn,philiplb/flynn,rikur/flynn,felixrieseberg/flynn,justintung/flynn,Brandywine2161/flynn,felixrieseberg/flynn,ozum/flynn,tonicbupt/flynn,Brandywine2161/flynn,Brandywine2161/flynn,mubassirhayat/flynn,benbjohnson/flynn,clifff/flynn,mubassirhayat/flynn,pkdevbox/flynn,Brandywine2161/flynn,flynn/flynn,tonicbupt/flynn,technosophos/flynn,benbjohnson/flynn,whouses/flynn,kgrz/flynn,arekkas/flynn,schatt/flynn,supermario/flynn,justintung/flynn,pkdevbox/flynn,justintung/flynn,mubassirhayat/flynn,jzila/flynn,GrimDerp/flynn,jzila/flynn,Brandywine2161/flynn,ozum/flynn,kgrz/flynn,benbjohnson/flynn,josephglanville/flynn,josephglanville/flynn,whouses/flynn,lmars/flynn,justintung/flynn,jzila/flynn,arekkas/flynn,lmars/flynn,tonicbupt/flynn,clifff/flynn,rikur/flynn,flynn/flynn,ozum/flynn,felixrieseberg/flynn,felixrieseberg/flynn,clifff/flynn,shads196770/flynn,lmars/flynn,benbjohnson/flynn,ozum/flynn,justintung/flynn,technosophos/flynn,GrimDerp/flynn,GrimDerp/flynn,shutej/flynn,ozum/flynn,schatt/flynn,jzila/flynn,clifff/flynn,pkdevbox/flynn,whouses/flynn,shads196770/flynn,flynn/flynn,supermario/flynn,josephglanville/flynn,supermario/flynn,flynn/flynn,rikur/flynn,schatt/flynn,kgrz/flynn,schatt/flynn,rikur/flynn,lmars/flynn,whouses/flynn,GrimDerp/flynn,josephglanville/flynn,jzila/flynn,kgrz/flynn,pkdevbox/flynn,supermario/flynn,shads196770/flynn,pkdevbox/flynn,mubassirhayat/flynn,pkdevbox/flynn,clifff/flynn,technosophos/flynn,rikur/flynn,TribeMedia/flynn,philiplb/flynn,lmars/flynn,ozum/flynn,schatt/flynn,whouses/flynn,technosophos/flynn,shads196770/flynn,philiplb/flynn,jzila/flynn