Update issue templates (#6) (#12)

* Update issue templates

* Update templates

* Some cosmetic changes

* More wording

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[TITLE]"
+labels: 'bug-report'
+assignees: ''
+
+---
+# [TITLE]
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS & Version: [e.g. iOS 10.2.1]
+ - Browser & Version [e.g. chrome v71.0.12345]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser & Version [e.g. stock browser v0.1.2]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/new_proposal.md

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+---
+name: Idea proposal
+about: Suggest an idea for this project
+title: "[TITLE]"
+labels: proposal
+assignees: ''
+
+---
+
+# [TITLE]
+
+## Metadata
+
+This proposal is (tick applicable):
+
+* [ ] A new feature
+* [ ] An extension to an existing RFC/proposal <LINK>
+* [ ] An alternative approach to an existing RFC or proposal <LINK>
+
+### Change log
+
+| Date | Changes |
+|:-----|:--------|
+|      |         |
+
+### Goals
+_What problems is this proposal addressing?_
+
+### Assumptions
+_These proposals seldom live in a vacuum. The proposal might presuppose that some other feature has been implemented, or
+that a certain ECC curve is used etc. List those assumptions here._
+
+### Abstract
+_A short summary of how the solution in this proposal works._
+
+## Description
+
+_Type out the body of the proposal here_

.github/PULL_REQUEST_TEMPLATE.md

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+# [TITLE]
+
+This PR
+ * [ ] fixes issue #nnn
+ * [ ] adds a new feature
+ * [ ] refactors a feature
+ * [ ] adds new tests
+ * [ ] adds cosmetic changes (typos, formatting)
+ * [ ] Other: (...)
+
+# Reminders checklist
+* [ ] Merging against the `development` branch
+* [ ] Ran `cargo-fmt --all` before pushing
+
+# Description
+
+Describe briefly what this PR does
+