Apply suggestions from code review

Author: baywet

docs/proguard-rules.txt

@@ -16,8 +16,8 @@
 -keep class * implements com.google.gson.JsonSerializer
 -keep class * implements com.google.gson.JsonDeserializer
 
--dontnote sun.misc.Unsafe # see line 119
--dontnote com.google.gson.** # see line 119
+-dontnote sun.misc.Unsafe
+-dontnote com.google.gson.**
 
 # JUnit
 -dontwarn org.junit.**
@@ -36,4 +36,4 @@
 -keep class sun.misc.Unsafe { *; }
 -dontwarn java.nio.file.*
 -dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
--dontwarn okio.**
+-dontwarn okio.**