Update bug.md

Author: ashwinraghav

.github/ISSUE_TEMPLATE/bug.md

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 name: ⚠️ Report a Bug
 about: Think you found a bug in the SDK? Report it here.
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 ### [READ] Step 1: Are you in the right place?
 **Thank you for submitting your issue. We are operating at reduced capacity from Dec 18 2020 to Jan 4 2021. Please expect delayed responses. For more urgent requests please reach us via our  support channels https://firebase.google.com/support**