Add DCO and fix badges in readme

.github/wordlist.txt

@@ -9,6 +9,8 @@ ClusterPipeline
 ClusterPubSub
 ConnectionPool
 CoreCommands
+DCO
+DeveloperCertificate
 EVAL
 EVALSHA
 GraphCommands
@@ -75,6 +77,7 @@ boolean
 booleans
 bysource
 charset
+configs
 del
 dev
 docstring

.github/workflows/dco.yml

@@ -0,0 +1,9 @@
+name: DCO Check
+
+on: [pull_request]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: tisonkun/actions-dco@v1.1

CONTRIBUTING.md

@@ -14,6 +14,62 @@ If you don't know where to start, consider improving
 documentation, bug triaging, and writing tutorials are all examples of
 helpful contributions that mean less work for you.
 
+## Developer Certificate of Origin
+
+We respect the intellectual property rights of others and we want to make sure
+all incoming contributions are correctly attributed and licensed. A Developer
+Certificate of Origin (DCO) is a lightweight mechanism to do that. The DCO is
+a declaration attached to every commit. In the commit message of the contribution,
+the developer simply adds a `Signed-off-by` statement and thereby agrees to the DCO,
+which you can find below or at [DeveloperCertificate.org](http://developercertificate.org/).
+
+```text
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the
+    best of my knowledge, is covered under an appropriate open
+    source license and I have the right under that license to
+    submit that work with modifications, whether created in whole
+    or in part by me, under the same open source license (unless
+    I am permitted to submit under a different license), as
+    Indicated in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including
+    all personal information I submit with it, including my
+    sign-off) is maintained indefinitely and may be redistributed
+    consistent with this project or the open source license(s)
+    involved.
+```
+
+We require that every contribution to Valkey to be signed with a DCO. We require the
+usage of known identity (such as a real or preferred name). We do not accept anonymous
+contributors nor those utilizing pseudonyms. A DCO signed commit will contain a line like:
+
+
+```text
+Signed-off-by: Jane Smith <jane.smith@email.com>
+```
+
+You may type this line on your own when writing your commit messages. However, if your
+user.name and user.email are set in your git configs, you can use `git commit` with `-s`
+or `--signoff` to add the `Signed-off-by` line to the end of the commit message. We also
+require revert commits to include a DCO.
+
+If you're contributing code to the Valkey project in any other form, including
+sending a code fragment or patch via private email or public discussion groups,
+you need to ensure that the contribution is in accordance with the DCO.
+
 ## Your First Contribution
 
 Unsure where to begin contributing? You can start by looking through

README.md

@@ -2,14 +2,14 @@
 
 The Python interface to the Valkey key-value store.
 
-[![CI](https://github.com/aiven-sal/valkey-py/workflows/CI/badge.svg?branch=master)](https://github.com/aiven-sal/valkey-py/actions?query=workflow%3ACI+branch%3Amaster)
-[![docs](https://readthedocs.org/projects/valkey-py/badge/?version=stable&style=flat)](https://valkey-py.readthedocs.io/en/stable/)
+[![CI](https://github.com/aiven-sal/valkey-py/workflows/CI/badge.svg?branch=main)](https://github.com/aiven-sal/valkey-py/actions?query=workflow%3ACI+branch%3Amain)
+[![docs](https://readthedocs.org/projects/valkey-py/badge/?version=latest&style=flat)](https://valkey-py.readthedocs.io/en/latest/)
 [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
 [![pypi](https://badge.fury.io/py/valkey.svg)](https://pypi.org/project/valkey/)
 [![pre-release](https://img.shields.io/github/v/release/aiven-sal/valkey-py?include_prereleases&label=latest-prerelease)](https://github.com/aiven-sal/valkey-py/releases)
-[![codecov](https://codecov.io/gh/aiven-sal/valkey-py/branch/master/graph/badge.svg?token=yenl5fzxxr)](https://codecov.io/gh/aiven-sal/valkey-py)
+[![codecov](https://codecov.io/gh/aiven-sal/valkey-py/branch/main/graph/badge.svg?token=yenl5fzxxr)](https://codecov.io/gh/aiven-sal/valkey-py)
 
-[Installation](#installation) |  [Usage](#usage) | [Advanced Topics](#advanced-topics) | [Contributing](https://github.com/aiven-sal/valkey-py/blob/master/CONTRIBUTING.md)
+[Installation](#installation) |  [Usage](#usage) | [Advanced Topics](#advanced-topics) | [Contributing](https://github.com/aiven-sal/valkey-py/blob/main/CONTRIBUTING.md)
 
 ---------------------------------------------
 
@@ -71,7 +71,7 @@ Alternatively, you might want to look at [Async connections](https://valkey-py.r
 
 ### Valkey Commands
 
-There is built-in support for all of the [out-of-the-box Valkey commands](https://valkey.io/commands). They are exposed using the raw Redis command names (`HSET`, `HGETALL`, etc.) except where a word (i.e. del) is reserved by the language. The complete set of commands can be found [here](https://github.com/valkey/valkey-py/tree/master/redis/commands), or [the documentation](https://valkey-py.readthedocs.io/en/stable/commands.html).
+There is built-in support for all of the [out-of-the-box Valkey commands](https://valkey.io/commands). They are exposed using the raw Redis command names (`HSET`, `HGETALL`, etc.) except where a word (i.e. del) is reserved by the language. The complete set of commands can be found [here](https://github.com/aiven-sal/valkey-py/tree/main/valkey/commands), or [the documentation](https://valkey-py.readthedocs.io/en/stable/commands.html).
 
 ## Advanced Topics