Update issue templates

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom issue template
+about: Describe this issue template's purpose here.
+
+---
+
+

.github/ISSUE_TEMPLATE/report-a-bug.md

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+---
+name: Report a bug
+about: Report a bug with ALE.
+
+---
+
+<!--
+  This is the template for reporting ALE bugs. Make sure you try updating ALE
+  to a more recent version before reporting a bug. Look through existing bug
+  reports for similar issues before reporting a new one. Don't leave comments
+  about new bugs in the comment section for old issues.
+
+  Make sure to try disabling other plugins and trying to repeat your bug before
+  reporting it in ALE. Some times problems can arise when two plugins are used
+  together, but often your issues might be problems with other plugins.
+-->
+
+## Information
+
+**VIM version**
+
+<!-- Paste just the first two lines of :version here. -->
+
+Operating System: <!-- Describe your operating system version. -->
+
+### :ALEInfo
+
+<!-- Paste the output of :ALEInfo here. Try :ALEInfoToClipboard -->
+<!-- Make sure to run :ALEInfo from the buffer where the bug occurred. -->
+
+## What went wrong
+
+<!-- Describe what went wrong here. -->
+
+## Reproducing the bug
+
+<!-- Write a list of steps below. -->
+
+1. I did this.
+2. Then this happened.

.github/ISSUE_TEMPLATE/suggest-a-new-linter-or-fixer.md

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+---
+name: Suggest a new linter or fixer
+about: Suggest a new tool ALE can officially integrate with.
+
+---
+
+<!--
+  Write "Add support for foobar" as the issue title, or similar.
+
+  Fill out the details below.
+-->
+
+**Name:** foobar
+**URL:** https://foo.bar.com
+
+<!--
+  Write a description of the tool, and add any other information you think might
+  be helpful. Consider creating a pull request to add support for the tool
+  yourself.
+-->

.github/ISSUE_TEMPLATE/suggest-an-improvement.md

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+---
+name: Suggest an improvement
+about: Suggest some way to improve ALE, or add a new feature.
+
+---
+
+<!-- There's no fixed format for feature requests. Just add your thoughts. -->