update README.md: application:start(bear) is required before application:start(folsom)

[trevlovett]

In third block of README.md, I would suggest adding application:start(bear) before application:start(folsom). Otherwise the user will get this error:
{error,{not_started,bear}}

[puzza007]

@trevlovett this project is no longer being maintained. Try https://github.com/folsom-project/folsom