Add sentry as a premium sponsor [skip ci] (#4221)

Add Sentry as a premium sponsor.

README.md

@@ -19,12 +19,15 @@ continued development by **[signing up for a paid plan][funding]**.
 
 The initial aim is to provide a single full-time position on REST framework.
 Right now we're a little over 43% of the way towards achieving that.
-Every single sign-up makes a significant impact, as an example taking out a
-basic tier sponsorship moves us about 1% closer to our funding target.
+*Every single sign-up makes a significant impact.* Taking out a
+[basic tier sponsorship](https://fund.django-rest-framework.org/topics/funding/#corporate-plans) moves us about 1% closer to our funding target.
 
-[![rover-image]][rover]
+<p align="center">
+  <a href="http://jobs.rover.com/"><img src="https://raw.githubusercontent.com/tomchristie/django-rest-framework/master/docs/img/premium/rover-readme.png"/></a>
+  <a href="https://getsentry.com/welcome/"><img src="https://raw.githubusercontent.com/tomchristie/django-rest-framework/master/docs/img/premium/sentry-readme.png"/></a>
+</p>
 
-*Many thanks to all our [awesome sponsors][sponsors], and in particular to our premium backers, [Rover][rover].*
+*Many thanks to all our [awesome sponsors][sponsors], and in particular to our premium backers, [Rover](http://jobs.rover.com/) and [Sentry](https://getsentry.com/welcome/).*
 
 ---
 
@@ -183,8 +186,6 @@ Send a description of the issue via email to [rest-framework-security@googlegrou
 
 [funding]: https://fund.django-rest-framework.org/topics/funding/
 [sponsors]: https://fund.django-rest-framework.org/topics/funding/#our-sponsors
-[rover]: http://jobs.rover.com/
-[rover-image]: https://raw.githubusercontent.com/tomchristie/django-rest-framework/master/docs/img/rover.png
 
 [oauth1-section]: http://www.django-rest-framework.org/api-guide/authentication/#django-rest-framework-oauth
 [oauth2-section]: http://www.django-rest-framework.org/api-guide/authentication/#django-oauth-toolkit

docs/index.md

+<style>
+.promo li a {
+    float: left;
+    width: 130px;
+    height: 20px;
+    text-align: center;
+    margin: 10px 30px;
+    padding: 150px 0 0 0;
+    background-position: 0 50%;
+    background-size: 130px auto;
+    background-repeat: no-repeat;
+    font-size: 120%;
+    color: black;
+}
+.promo li {
+    list-style: none;
+}
+</style>
+
 <p class="badges" height=20px>
     <iframe src="http://ghbtns.com/github-btn.html?user=tomchristie&amp;repo=django-rest-framework&amp;type=watch&amp;count=true" class="github-star-button" allowtransparency="true" frameborder="0" scrolling="0" width="110px" height="20px"></iframe>
 
@@ -38,24 +57,28 @@ Some reasons you might want to use REST framework:
 * [Serialization][serializers] that supports both [ORM][modelserializer-section] and [non-ORM][serializer-section] data sources.
 * Customizable all the way down - just use [regular function-based views][functionview-section] if you don't need the [more][generic-views] [powerful][viewsets] [features][routers].
 * [Extensive documentation][index], and [great community support][group].
-* Used and trusted by large companies such as [Mozilla][mozilla] and [Eventbrite][eventbrite].
+* Used and trusted by internationally recognised companies including [Mozilla][mozilla], [Red Hat][redhat], [Heroku][heroku], and [Eventbrite][eventbrite].
 
 ---
 
-We are a [collaboratively funded project](https://fund.django-rest-framework.org/topics/funding/).
-Many thanks to our sponsors for ensuring we can continue to develop, support and improve Django REST framework.
+## Funding
 
-<a href="https://www.rover.com/" rel="nofollow" style="background-image:url(./img/rover.png);
-display:block;
-    width: 300px;
-    height: 0px;
-    text-align: center;
-    margin: 10px auto 30px;
-    padding: 300px 0 0 0;
-    background-position: 0 50%;
-    background-size: 280px auto;
-    background-repeat: no-repeat;
-    font-size: 150%;">Rover.com</a>
+REST framework is a *collaboratively funded project*. If you use
+REST framework commercially we strongly encourage you to invest in its
+continued development by **[signing up for a paid plan][funding]**.
+
+The initial aim is to provide a single full-time position on REST framework.
+Right now we're a little over 43% of the way towards achieving that.
+*Every single sign-up makes a significant impact.* Taking out a
+[basic tier sponsorship](https://fund.django-rest-framework.org/topics/funding/#corporate-plans) moves us about 1% closer to our funding target.
+
+<ul class="premium-promo promo">
+    <li><a href="http://jobs.rover.com/" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/rover_130x130.png)">Rover.com</a></li>
+    <li><a href="https://getsentry.com/welcome/" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/sentry130.png)">Sentry</a></li>
+</ul>
+<div style="clear: both; padding-bottom: 20px;"></div>
+
+*Many thanks to all our [awesome sponsors][sponsors], and in particular to our premium backers, [Rover](http://jobs.rover.com/) and [Sentry](https://getsentry.com/welcome/).*
 
 ---
 
@@ -270,6 +293,8 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 [mozilla]: http://www.mozilla.org/en-US/about/
+[redhat]: https://www.redhat.com/
+[heroku]: https://www.heroku.com/
 [eventbrite]: https://www.eventbrite.co.uk/about/
 [markdown]: http://pypi.python.org/pypi/Markdown/
 [django-filter]: http://pypi.python.org/pypi/django-filter
@@ -284,6 +309,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 [modelserializer-section]: api-guide/serializers#modelserializer
 [functionview-section]: api-guide/views#function-based-views
 [sandbox]: http://restframework.herokuapp.com/
+[sponsors]: https://fund.django-rest-framework.org/topics/funding/#our-sponsors
 
 [quickstart]: tutorial/quickstart.md
 [tut-1]: tutorial/1-serialization.md