Update issue templates

.github/ISSUE_TEMPLATE/stake-heist-submission.md

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+---
+name: stake heist submission
+about: Submit work for Stake Heist Hackathon
+title: "[submission]"
+labels: stake-heist
+assignees: gizemcakil
+
+---
+
+# Linked bounty (please link the related bounty posting for your work)
+
+# Description of the bug, vulnerability, security threat OR the product/tool
+
+# Steps to reproduce the reported vulnerability OR steps taken to build the product/tool
+
+# Proof of exploitability OR proof of use-case (e.g. screenshot, video, github code source)
+
+# Perceived impact to another user or the organization
+
+# List of URLs and affected parameters (if applicable)
+
+# Browser, OS and/or app version used during testing (if applicable)