Remove email address to avoid receiving potential spam mails.

(cherry picked from commit fe519e6cb71e0be7a33593f7f6e96c362cb105c8)
diff --git a/gradle/pomconfigurer.gradle b/gradle/pomconfigurer.gradle
index 33c62d3..2910dff 100644
--- a/gradle/pomconfigurer.gradle
+++ b/gradle/pomconfigurer.gradle
@@ -359,7 +359,6 @@
             developer {
                 id 'sunlan'
                 name 'Daniel Sun'
-                email 'realbluesun@hotmail.com'
                 roles {
                     role 'Developer'
                     role 'Despot'