Update plugin-publish-plugin (#97)

Author: timyates

build.gradle

@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.gradle.publish:plugin-publish-plugin:0.9.1'
+        classpath 'com.gradle.publish:plugin-publish-plugin:0.9.9'
         classpath 'com.github.ben-manes:gradle-versions-plugin:0.13.0'
         classpath 'com.vanniktech:gradle-android-junit-jacoco-plugin:0.9.0'
     }