Improvement: Publish intellij plugin (#24)

We are now publishing the intellij plugin to the plugin portal. See https://plugins.jetbrains.com/plugin/13180-palantir-java-format

README.md

@@ -43,7 +43,7 @@ a single format.*
 ### IntelliJ, Android Studio, and other JetBrains IDEs
 
 A
-[palantir-java-format IntelliJ plugin](https://plugins.jetbrains.com/plugin/8527)
+[palantir-java-format IntelliJ plugin](https://plugins.jetbrains.com/plugin/13180)
 is available from the plugin repository. To install it, go to your IDE's
 settings and select the `Plugins` category. Click the `Marketplace` tab, search
 for the `palantir-java-format` plugin, and click the `Install` button.

changelog/@unreleased/pr-24.v2.yml

@@ -0,0 +1,6 @@
+type: improvement
+improvement:
+  description: We are now publishing the intellij plugin to the plugin portal. See
+    https://plugins.jetbrains.com/plugin/13180-palantir-java-format
+  links:
+  - https://github.com/palantir/palantir-java-format/pull/24

idea-plugin/build.gradle

@@ -32,10 +32,14 @@ patchPluginXml {
     untilBuild = ''
 }
 
-// TODO(dsanduleac): publish to official IntelliJ plugin repository
-// publishPlugin {
-//     token = System.env.JETBRAINS_PLUGIN_REPO_TOKEN
-// }
+publishPlugin {
+    token = System.env.JETBRAINS_PLUGIN_REPO_TOKEN
+    if (!versionDetails().isCleanTag) {
+        channels 'eap'
+    }
+}
+
+tasks.publish.dependsOn publishPlugin
 
 configurations {
     formatter {