chore(ISSUE_TEMPLATE.md): include link to Gitter channel in issue template
chore(ISSUE_TEMPLATE.md): include link to Gitter channel in issue template

jesinity/redux-observable,blesh/redux-observable,blesh/redux-observable,redux-observable/redux-observable,jesinity/redux-observable,redux-observable/redux-observable,redux-observable/redux-observable,jesinity/redux-observable