Update Issue Template to direct security issue to email (#10562)

* Direct security issues to security@ email instead

* Explicitly mentioned out BugBounty and SECURITY.md docs

* Update .github/ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

@@ -1,10 +1,14 @@
 _Before filing a new issue, please **provide the following information**._
 
+_If you think that your issue is an exploitable security vulnerability, please mail your bugreport to security@parity.io instead; your submission might be eligible for our Bug Bounty._
+_You can find mode info on the reporting process in [SECURITY.md](https://github.com/paritytech/parity-ethereum/blob/master/SECURITY.md)_
+
+
 - **Parity Ethereum version**: 0.0.0
 - **Operating system**: Windows / MacOS / Linux
 - **Installation**: homebrew / one-line installer / built from source
 - **Fully synchronized**: no / yes
-- **Network**: ethereum / ropsten / kovan / ...
+- **Network**: ethereum / ropsten / goerli / ...
 - **Restarted**: no / yes
 
 _Your issue description goes here below. Try to include **actual** vs. **expected behavior** and **steps to reproduce** the issue._