Changing over to signed ints
Adding key for messages
Removing unused var
Merge pull request #16 from nbrownus/signed_int

Use signed ints instead of unsigned ints
adjust code format
v0.1.1
crc needs to be a signed int
Merge pull request #20 from nbrownus/signed_int

crc needs to be a signed int
v0.1.2
Better consumer errors for non existing topics
Merge pull request #21 from nbrownus/errors

Better consumer errors for non existing topics
Consumer#addTopics test
Merge from main branch