docs: update calendar, add news item and link release notes for 18.3.0

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>

docs/index.html

@@ -15,6 +15,13 @@
 <div class="content">
 
 <h1>News</h1>
+<h2>December 7, 2018</h2>
+<p>
+<a href="relnotes/18.3.0.html">Mesa 18.3.0</a> is released.  This is a
+new development release.  See the release notes for more information
+about the release.
+</p>
+
 <h2>November 28, 2018</h2>
 <p>
 <a href="relnotes/18.2.6.html">Mesa 18.2.6</a> is released.

docs/release-calendar.html

@@ -46,28 +46,27 @@ if you'd like to nominate a patch in the next stable release.
 <td>Last planned 18.2.x release</td>
 </tr>
 <td rowspan="4">18.3</td>
-<td>2018-10-31</td>
-<td>18.3.0-rc1</td>
+<td>2018-12-19</td>
+<td>18.3.1</td>
 <td>Emil Velikov</td>
 <td></td>
 </tr>
 <tr>
-<td>2018-11-07</td>
-<td>18.3.0-rc2</td>
+<td>2019-01-09</td>
+<td>18.3.2</td>
 <td>Emil Velikov</td>
 <td/>
 </tr>
 <tr>
-<td>2018-11-14</td>
-<td>18.3.0-rc3</td>
+<td>2019-01-23</td>
+<td>18.3.3</td>
 <td>Emil Velikov</td>
 <td/>
 </tr>
 <tr>
-<td>2018-11-21</td>
-<td>18.3.0-rc4</td>
+<td>2019-02-06</td>
+<td>18.3.4</td>
 <td>Emil Velikov</td>
-<td>Last planned RC/final release</td>
 </tr>
 </table>
 

docs/relnotes.html

@@ -21,6 +21,7 @@ The release notes summarize what's new or changed in each Mesa release.
 </p>
 
 <ul>
+<li><a href="relnotes/18.3.0.html">18.3.0 release notes</a>
 <li><a href="relnotes/18.2.6.html">18.2.6 release notes</a>
 <li><a href="relnotes/18.2.5.html">18.2.5 release notes</a>
 <li><a href="relnotes/18.2.4.html">18.2.4 release notes</a>