* Update copyright

2018 -> 2019

* Update copyright

2018 -> 2019

params: postpone Constantinople due to net SSTORE reentrancy

* swarm/pot: refactored pot.remove(), updated comments

* swarm/pot: comments updated

* swarm/network: eachBin now starts at kaddepth for nn

* swarm/network: fix Kademlia.EachBin

* swarm/network: fix kademlia.EachBin

* swarm/network: correct EachBin implementation according to requirements

* swarm/network: less addresses simplified tests

* swarm: calc kad depth outside loop in EachBin test

* swarm/network: removed printResults

* swarm/network: cleanup imports

* swarm/network: remove kademlia.EachBin; fix RequestSubscriptions and add unit test

* swarm/network/stream: address PR comments

* swarm/network/stream: package-wide subscriptionFunc

* swarm/network/stream: refactor to kad.EachConn

* core, eth: fix database version

* eth: polish error message

Co-authored-by: weimumu <934657014@qq.com>

* swarm/network: Rename minproxbinsize, add as member of simulation

* swarm/network: Deactivate WaitTillHealthy, unreliable pending suggestpeer

* swarm/network, swarm/pss: remove isproxbin bool from kad.Each* iterfunc

* swarm/network: restore comment and unskip snapshot sync tests

* swarm/storage: fix T.Fatal inside a goroutine

* swarm/network/simulation: fix T.Fatal inside a goroutine

* swarm/network/stream: fix T.Fatal inside a goroutine

* swarm/network/simulation: consistent failures in TestPeerEventsTimeout

* swarm/network/simulation: rename sendRunSignal to triggerSimulationRun

* swarm: completed 1st phase of swap accounting

* swarm, p2p/protocols: added stream pricing

* swarm/network/stream: gofmt simplify stream.go

* swarm: fixed review comments

* swarm: used snapshots for swap tests

* swarm: custom retrieve for swap (less cascaded requests at any one time)

* swarm: addressed PR comments

* swarm: log output formatting

* swarm: removed parallelism in swap tests

* swarm: swap tests simplification

* swarm: removed swap_test.go

* swarm/network/stream: added prefix space for comments

* swarm/network/stream: unit test for prices

* swarm/network/stream: don't hardcode price

* swarm/network/stream: fixed invalid price check

* Changed dumpConfig function to optionally save to file

* Added O_TRUNC flag to file open and cleaned up code

* swarm/network: fix code inspection problems

- typos
- redundant import alias

* p2p/simulations: fix code inspection problems

- typos
- unused function parameters
- redundant import alias
- code style issue: snake case

* swarm/network: fix unused method parameters inspections

* eth/tracer: extend create2

* eth/tracers: fix create2-flaw in prestate_tracer

* eth/tracers: fix test

* eth/tracers: update assets

core/types: update incorrect comment

vendor, crypto, swarm: switch over to upstream sha3 package

* cmd/puppeth: fix panic error when export aleth genesis wo/ precompile-addresses

* cmd/puppeth: don't need to handle duplicate set

* travis, appveyor: bump to Go 1.11.4

* internal/build: revert comment changes

* add LGPL licence at update-licence.go

* add empty line