Add ARCH_LIFECYCLE_EXTENSIONS to the list of deps.

Test: None
Change-Id: I0d076a7cc4d388bee456d2636574d2478fbcedc6
diff --git a/buildSrc/src/main/kotlin/android/support/dependencies/Dependencies.kt b/buildSrc/src/main/kotlin/android/support/dependencies/Dependencies.kt
index 48103d2..e370801 100644
--- a/buildSrc/src/main/kotlin/android/support/dependencies/Dependencies.kt
+++ b/buildSrc/src/main/kotlin/android/support/dependencies/Dependencies.kt
@@ -57,4 +57,5 @@
 const val SUPPORT_V4 = "com.android.support:support-v4:$SUPPORT_VERSION"
 
 // Arch libraries
-const val ARCH_LIFECYCLE_RUNTIME = "android.arch.lifecycle:runtime:1.0.3@aar"
\ No newline at end of file
+const val ARCH_LIFECYCLE_RUNTIME = "android.arch.lifecycle:runtime:1.0.3@aar"
+const val ARCH_LIFECYCLE_EXTENSIONS = "android.arch.lifecycle:extensions:1.0.0@aar"