MINOR: README

Merge pull request #91 from lekoala/patch-3

fix null ip

FIX: Fixes undocumented issue where Security::getCurrentUser() can

return a bool as well as a null or Member

Merge remote-tracking branch 'origin/5.0'

Merge branch 'issue/silverstripe5-compat' into 5.0

MINOR: Docs

Merge branch 'issue/83'

Merge branch 'master' into 4.0

Updated README

Fixes PR #78 by using 'message' as key.

Also prevents Exceptions from logging > once.