DOC: Update PR template and CONTRIBUTING.md

Author: threecgreen

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,8 @@
 ## Description
 
-Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
+Please include a summary of the change and which issue is fixed.
+Please also include relevant motivation and context.
+List any dependencies that are required for this change.
 
 Fixes # (issue)
 
@@ -13,18 +15,24 @@ Please delete options that are not relevant.
 - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
 - [ ] This change requires a documentation update
 
-### How Has This Been Tested?
+### How has this been tested?
 
-Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration
+Please describe the tests that you ran to verify your changes.
+Provide instructions so we can reproduce.
+Please also list any relevant details for your test configuration.
 
 - [ ] Test A
 - [ ] Test B
 
+## Checklist
 
-### Checklist:
-
-- [ ] My code follows the style guidelines of this project
+- [ ] My code builds locally with no new warnings (`scripts/build.sh`)
+- [ ] My code follows the style guidelines (`scripts/lint.sh`)
+- [ ] New and existing unit tests pass locally with my changes (`scripts/test.sh`)
 - [ ] I have made corresponding changes to the documentation
-- [ ] My changes generate no new warnings
 - [ ] I have added tests that prove my fix is effective or that my feature works
-- [ ] New and existing unit tests pass locally with my changes
+
+### Declaration
+
+I confirm this contribution is made under an Apache 2.0 license and that I have the authority
+necessary to make this contribution on behalf of its copyright owner.

.github/workflows/test.yml

@@ -1,8 +1,8 @@
 name: test
 
 on:
+  pull_request:
   push:
-    branches: [main, dev]
 
 jobs:
   test:

CONTRIBUTING.md

@@ -1,3 +1,4 @@
-We welcome feedback through discussions and issues on GitHub, however we don't currently accept pull requests due to the open-soruce repository being a downstream mirror of our internal Python client library codebase.
-
-Please direct email feedback to [email protected] or [email protected].
+Thank you for taking the time to contribute to our project.
+We welcome feedback through discussions and issues on GitHub, as well as our [community Slack](https://databento.com/support).
+While we don't merge pull requests directly due to the open-source repository being a downstream
+mirror of our internal codebase, we can commit the changes upstream with the original author.