Bump up jackson dependency to 2.8.8

Change-Id: If9498ec17504dc0278a17d5f0dd5d89e756ee087
diff --git a/lib/deps.json b/lib/deps.json
index 2790907..8157d97 100644
--- a/lib/deps.json
+++ b/lib/deps.json
@@ -125,9 +125,9 @@
     "retrofit": "mvn:com.squareup.retrofit:retrofit:1.9.0",
     "okhttp": "mvn:com.squareup.okhttp:okhttp:2.4.0",
     "okio": "mvn:com.squareup.okio:okio:1.4.0",
-    "jackson-annotations": "mvn:com.fasterxml.jackson.core:jackson-annotations:2.8.6",
-    "jackson-core": "mvn:com.fasterxml.jackson.core:jackson-core:2.8.6",
-    "jackson-databind": "mvn:com.fasterxml.jackson.core:jackson-databind:2.8.6",
+    "jackson-annotations": "mvn:com.fasterxml.jackson.core:jackson-annotations:2.8.8",
+    "jackson-core": "mvn:com.fasterxml.jackson.core:jackson-core:2.8.8",
+    "jackson-databind": "mvn:com.fasterxml.jackson.core:jackson-databind:2.8.8",
     "javax.annotation-api": "mvn:javax.annotation:javax.annotation-api:1.2",
     "javax.inject": "mvn:org.glassfish.hk2.external:javax.inject:2.5.0-b32",
     "javax.ws.rs-api": "mvn:javax.ws.rs:javax.ws.rs-api:2.0.1",