re-fix build problem

build.gradle

@@ -67,7 +67,7 @@ jar {
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '4.2.1'
+    gradleVersion = '4.10.2'
 }
 
 buildscript {
@@ -191,10 +191,6 @@ test {
     }
 }
 
-signing {
-    sign configurations.archives
-}
-
 idea {
     module {
         downloadJavadoc = true
@@ -265,3 +261,7 @@ publishing {
         }
     }
 }
+
+signing {
+    sign publishing.publications.shadow
+}

gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.2.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-bin.zip