Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help improve php-bitcoinrpc
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+What code caused the problem.
+Feel free to omit any sensitive information.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Logs**
+If applicable, attach log files.
+Feel free to omit any sensitive information.
+
+**Cryptocurrency**
+Describe used software and network:
+* Software: Bitcoin Core v0.17.0
+* Network: mainnet or testnet
+
+**Environment**
+Describe your runtime environment:
+* PHP: 7.0 (run `php -v` to get php version)
+* Web Server (if applicable): nginx/1.15.3
+* System: Ubuntu 18.04.01 LTS
+
+**Additional information**
+Add any other information about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for php-bitcoinrpc
+
+---
+
+**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 the feature that you want. If applicable, provide links that describe feature.
+Ex. I want to be able to do multi-wallet requests. See: https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.15.0.md#multi-wallet-support [...]
+
+**Additional context**
+Add any other context or screenshots about the feature request here.