Proguard exemptions (#891)
Proguard exemptions (#891)

* Proguard exemptions 

Important to add PrebidServerAdapter package in proguard exemptions or you will get an error during the Prebid initialisation:
UNABLE_TO_INITIALIZE_DEMAND_SOURCE("Unable to instantiating the adapter.")

It is indeed failing to access PrebidServerAdapter package and raise an error when trying to create an instance of the class "org.prebid.mobile.prebidserver.PrebidServerAdapter" (line 141 of prebid.java)

* Update code-integration-android.md

* Update code-integration-android.md

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