[readme] update `learn more` link
[readme] update `learn more` link

the learn more url as changed, this fix the 404 error
introini/ourlist,tilt-silvie/samplemod,azafred/skeletor,introini/ourlist,azafred/samplemod,kevindiltinero/seass3,johicks/twitterbias,introini/ourlist,introini/ourlist,azafred/samplemod,kennethreitz/samplemod,yazquez/samplemod,azafred/skeletor,Cyclid/example-python-project,avihoo/samplemod