Update gradle publish plugin to latest version

* This was a requirement to publish again.
* `plugin` is no longer an allowed tag.

apilint/build.gradle

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 plugins {
-    id 'com.gradle.plugin-publish' version '0.18.0'
+    id 'com.gradle.plugin-publish' version '1.2.1'
     id 'java-gradle-plugin'
     id 'groovy'
     id 'maven-publish'
@@ -27,8 +27,9 @@ version '0.5.3'
 
 gradlePlugin {
     plugins {
-        apilint {
+        apilintPlugin {
             id = Config.GROUP
+            displayName = 'API Lint plugin'
             implementationClass = 'org.mozilla.apilint.ApiLintPlugin'
         }
     }
@@ -38,14 +39,8 @@ pluginBundle {
     website = 'https://github.com/mozilla-mobile/gradle-apilint'
     vcsUrl = 'https://github.com/mozilla-mobile/gradle-apilint'
 
-    tags = ['api', 'lint', 'mozilla', 'plugin', 'compatibility']
+    tags = ['api', 'lint', 'mozilla', 'compatibility']
     description = 'Tracks the API of an Android library and helps maintain backward compatibility.'
-
-    plugins {
-        apilint {
-            displayName = 'API Lint plugin'
-        }
-    }
 }
 
 task testApiLint(type: Exec) {