Add PostHog as premium sponsors (#8193)

* Add PostHog as premium sponsors

* Adding 275x250 PostHog image

Author: leggetter

README.md

@@ -25,8 +25,9 @@ The initial aim is to provide a single full-time position on REST framework.
 [![][esg-img]][esg-url]
 [![][retool-img]][retool-url]
 [![][bitio-img]][bitio-url]
+[![][posthog-img]][posthog-url]
 
-Many thanks to all our [wonderful sponsors][sponsors], and in particular to our premium backers, [Sentry][sentry-url], [Stream][stream-url], [Rollbar][rollbar-url], [ESG][esg-url], [Retool][retool-url], and [bit.io][bitio-url].
+Many thanks to all our [wonderful sponsors][sponsors], and in particular to our premium backers, [Sentry][sentry-url], [Stream][stream-url], [Rollbar][rollbar-url], [ESG][esg-url], [Retool][retool-url], [bit.io][bitio-url], and [PostHog][posthog-url].
 
 ---
 
@@ -195,13 +196,15 @@ Please see the [security policy][security-policy].
 [esg-img]: https://raw.githubusercontent.com/encode/django-rest-framework/master/docs/img/premium/esg-readme.png
 [retool-img]: https://raw.githubusercontent.com/encode/django-rest-framework/master/docs/img/premium/retool-readme.png
 [bitio-img]: https://raw.githubusercontent.com/encode/django-rest-framework/master/docs/img/premium/bitio-readme.png
+[posthog-img]: https://raw.githubusercontent.com/encode/django-rest-framework/master/docs/img/premium/posthog-readme.png
 
 [sentry-url]: https://getsentry.com/welcome/
 [stream-url]: https://getstream.io/?utm_source=drf&utm_medium=sponsorship&utm_content=developer
 [rollbar-url]: https://rollbar.com/?utm_source=django&utm_medium=sponsorship&utm_campaign=freetrial
 [esg-url]: https://software.esg-usa.com/
 [retool-url]: https://retool.com/?utm_source=djangorest&utm_medium=sponsorship
 [bitio-url]: https://bit.io/jobs?utm_source=DRF&utm_medium=sponsor&utm_campaign=DRF_sponsorship
+[posthog-url]: https://posthog.com?utm_source=drf&utm_medium=sponsorship&utm_campaign=open-source-sponsorship
 
 [oauth1-section]: https://www.django-rest-framework.org/api-guide/authentication/#django-rest-framework-oauth
 [oauth2-section]: https://www.django-rest-framework.org/api-guide/authentication/#django-oauth-toolkit

docs/img/premium/posthog-readme.png

@@ -72,10 +72,11 @@ continued development by **[signing up for a paid plan][funding]**.
     <li><a href="https://rollbar.com" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/rollbar2.png)">Rollbar</a></li>
     <li><a href="https://retool.com/?utm_source=djangorest&utm_medium=sponsorship" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/retool-sidebar.png)">Retool</a></li>
     <li><a href="https://bit.io/jobs?utm_source=DRF&utm_medium=sponsor&utm_campaign=DRF_sponsorship" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/bitio_logo_gold_background.png)">bit.io</a></li>
+    <li><a href="https://posthog.com?utm_source=DRF&utm_medium=sponsor&utm_campaign=DRF_sponsorship" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/posthog-130.png)">PostHog</a></li>
 </ul>
 <div style="clear: both; padding-bottom: 20px;"></div>
 
-*Many thanks to all our [wonderful sponsors][sponsors], and in particular to our premium backers, [Sentry](https://getsentry.com/welcome/), [Stream](https://getstream.io/?utm_source=drf&utm_medium=sponsorship&utm_content=developer), [ESG](https://software.esg-usa.com/), [Rollbar](https://rollbar.com/?utm_source=django&utm_medium=sponsorship&utm_campaign=freetrial), [Cadre](https://cadre.com), [Kloudless](https://hubs.ly/H0f30Lf0), [Lights On Software](https://lightsonsoftware.com), [Retool](https://retool.com/?utm_source=djangorest&utm_medium=sponsorship), and [bit.io](https://bit.io/jobs?utm_source=DRF&utm_medium=sponsor&utm_campaign=DRF_sponsorship).*
+*Many thanks to all our [wonderful sponsors][sponsors], and in particular to our premium backers, [Sentry](https://getsentry.com/welcome/), [Stream](https://getstream.io/?utm_source=drf&utm_medium=sponsorship&utm_content=developer), [ESG](https://software.esg-usa.com/), [Rollbar](https://rollbar.com/?utm_source=django&utm_medium=sponsorship&utm_campaign=freetrial), [Cadre](https://cadre.com), [Kloudless](https://hubs.ly/H0f30Lf0), [Lights On Software](https://lightsonsoftware.com), [Retool](https://retool.com/?utm_source=djangorest&utm_medium=sponsorship), [bit.io](https://bit.io/jobs?utm_source=DRF&utm_medium=sponsor&utm_campaign=DRF_sponsorship), and [bit.io](https://posthog.com?utm_source=DRF&utm_medium=sponsor&utm_campaign=DRF_sponsorship).*
 
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