Update Proguard 6.0 to Proguard 6.0.1

Change-Id: I4c2d62061df89ff2092fe6d4558640b9cdd1b408
diff --git a/build.gradle b/build.gradle
index f857f9e..6a821a5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -300,7 +300,7 @@
                 "android_jar/lib-v25",
                 "android_jar/lib-v26",
                 "proguard/proguard5.2.1",
-                "proguard/proguard6.0",
+                "proguard/proguard6.0.1",
                 "gradle/gradle",
                 "jdwp-tests",
                 "jasmin",