Update issue templates

[john-tornblom]

No description provided.

[coveralls]

Coverage remained the same at 80.039% when pulling 6902ee4 on bug-report-template into d94f79a on master.

[github-actions]

Unit Test Results

    4 files  ±0      4 suites  ±0   1m 29s ⏱️ +14s
238 tests ±0  238 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
952 runs  ±0  952 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 6902ee4. ± Comparison against base commit d94f79a.

♻️ This comment has been updated with latest results.

[john-tornblom]

This PR serves to improve bug reports submitted to pyxtuml. Does it need to include more information, or is it to much?

[john-tornblom]

FYI, users submitting bug reports will now be presented with the following template.

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Obtain input model from '...'
2. Launch pyxtuml with the command line '...'
3. Observe the reported error meesage

Expected behavior
A clear and concise description of what you expected to happen.

Environment (please complete the following information):

• OS: [e.g. iOS]
• Metamodel version (or Bridgepoint version used)
• Python version [e.g. 3.7]
• pyxtuml version [e.g. 2.3.0]

Additional context
Add any other context about the problem here.