**What does this do?**
It removes the very strict sanitation on the users bio field, so that people can
have a bio like "I <3 GitLab"

**Why is this needed?**
Currently when you enter a bio with "I <3 GitLab", we only store "I ". This is
unexpected behaviour, since we want users to have a normal profile, without
having to worry what characters are allowed and which are not.

**Related issues:**
Fixes https://github.com/gitlabhq/gitlabhq/issues/5625Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>