Add dictionary methods to docs
Add dictionary methods to docs

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