Only apply dependencies.gradle to root project

The ExtraPropertiesExtension of the root project is available on subprojects directly as well
diff --git a/build.gradle b/build.gradle
index 063f279..865f0b3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,8 +12,9 @@
     }
 }
 
+apply from: rootProject.file('dependencies.gradle')
+
 allprojects {
-    project -> project.apply from: rootProject.file('dependencies.gradle')
     repositories {
         jcenter()
     }