Update issue templates (#4867)

.github/ISSUE_TEMPLATE/---feature-request.md

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+---
+name: "\U0001F4A1 Feature request"
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/---push-notifications.md

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+---
+name: "\U0001F4F2 Push Notifications"
+about: Issues with setting up or delivering push notifications
+
+---
+
+

.github/ISSUE_TEMPLATE/---report-an-issue.md

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+---
+name: "\U0001F41B Report an issue"
+about: Report an issue on parse-server
+
+---
+
+<!--- 
+
+We use GitHub Issues for bugs.
+
+If you have a non-bug question, ask on Stack Overflow or Server Fault: 
+- https://stackoverflow.com/questions/tagged/parse.com 
+- https://serverfault.com/tags/parse
+
+If you have a vulnerability disclosure, please follow our policy available here https://github.com/parse-community/parse-server/blob/master/SECURITY.md
+
+You may also search through existing issues before opening a new one: https://github.com/parse-community/parse-server/issues?utf8=%E2%9C%93&q=is%3Aissue 
+
+--- Please use this template. If you don't use this template, your issue may be closed without comment. ---
+--->
+### Issue Description
+
+<!--- Describe your issue in as much detail as possible. -->
+
+### Steps to reproduce
+
+<!--- Please include a detailed list of steps that reproduce the issue. Include curl commands when applicable.  --->
+ 
+### Expected Results
+
+<!--- What you expected to happen. --->
+
+### Actual Outcome
+
+<!--- What is happening instead. --->
+
+### Environment Setup
+
+- **Server**
+  - parse-server version (Be specific! Don't say 'latest'.) : [FILL THIS OUT]
+  - Operating System:     [FILL THIS OUT]
+  - Hardware:             [FILL THIS OUT]
+  - Localhost or remote server? (AWS, Heroku, Azure, Digital Ocean, etc): [FILL THIS OUT]
+
+- **Database**
+  - MongoDB version: [FILL THIS OUT]
+  - Storage engine:  [FILL THIS OUT]
+  - Hardware:        [FILL THIS OUT]
+  - Localhost or remote server? (AWS, mLab, ObjectRocket, Digital Ocean, etc): [FILL THIS OUT]
+
+### Logs/Trace
+
+<!--- Include all relevant logs. You can turn on additional logging by configuring VERBOSE=1 in your environment. --->