Bump version for v0.3.8
Bump version for v0.3.8

tempbottle/pycapnp,SymbiFlow/pycapnp,tempbottle/pycapnp,jparyani/pycapnp,jparyani/pycapnp,jparyani/pycapnp,jparyani/pycapnp,SymbiFlow/pycapnp,SymbiFlow/pycapnp,rcrowder/pycapnp,tempbottle/pycapnp,rcrowder/pycapnp,SymbiFlow/pycapnp,rcrowder/pycapnp,rcrowder/pycapnp,tempbottle/pycapnp