Dynamic library release 4.9.0-dylib

updates to build with latest libxmtp

Release 4.9.0

update podspec for local testing

Release 4.9.0-dev.c190039

Release 4.9.0-dev.90e114a

Release 4.9.0-dev.fce3ad0

Dynamic library release 4.9.0-dev.fce3ad0-dylib