Release v1.2.0

Merge branch 'chrysalis-2' into v1.1.0

Cargo: increment crates, iota_streams 1.0.1

Signed-off-by: DyrellC <[email protected]>

Merge pull request iotaledger-archive#40 from iotaledger/kwek20-patch-2

Updated C bindings instructions

Merge pull request iotaledger-archive#33 from kwek20/binary

quick readme update