Add a note about jshint to README
Add a note about jshint to README

tmayr/ember-cli-sentry,hussfelt/ember-cli-sentry,damiencaselli/ember-cli-sentry,dschmidt/ember-cli-sentry,hussfelt/ember-cli-sentry,pifantastic/ember-cli-sentry,dschmidt/ember-cli-sentry,damiencaselli/ember-cli-sentry,pifantastic/ember-cli-sentry,tmayr/ember-cli-sentry