Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: Trouble-shooting
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**TwelveMonkeys ImageIO version**
+The version of the library in use.
+
+For example:
+
+    4.0.0
+
+**Java version**
+The *exact* output of `java --version` (or `java -version` for older Java releases). 
+
+For example: 
+
+    java version "1.8.0_271"
+    Java(TM) SE Runtime Environment (build 1.8.0_271-b09)
+    Java HotSpot(TM) 64-Bit Server VM (build 25.271-b09, mixed mode)
+
+**Environment info**
+Extra information about OS version, server version, standalone program or web application packaging, executable wrapper, etc. Please state exact version numbers where applicable.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+1. Compile the below sample code
+2. Download the sample image file
+3. Run the code with the sample file
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Example code**
+Preferably as a failing JUnit test, or a standalone program with a `main` method that showcases the problem. 
+
+Less is more. Don't add your entire project, only the code required to reproduce the problem. 😀 
+
+**Sample file**
+Attach any sample files needed to reproduce the problem. Use a ZIP-file if the format is not directly supported by GitHub.
+
+**Stak trace**
+Always include the stack trace you experience.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+Do not add screenshots of code or stack traces. 😀 
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem or use case is. 
+
+**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, like links to specifications or sample files.