fixed installation docs
fixed installation docs

before it always installed 1.0.0 and not the lastest bugfix release. fixes #203.
filp/whoops,oligriffiths/whoops,michabbb-backup/whoops,staabm/whoops,Vmak11/whoops,stefen/whoops,oligriffiths/whoops,nonconforme/whoops,stefen/whoops,UnderDogg/whoops,nonconforme/whoops,filp/whoops,michabbb-backup/whoops,emilkje/whoops,staabm/whoops,Vmak11/whoops,emilkje/whoops,UnderDogg/whoops