v0.18.7.1

Merge PR ：fix failed to get block height via the keywrod block.number…

v0.18.7

Merge PR: add check of watch db enabled in handler (#877)

v0.18.6

Merge PR：change version to v0.18.6 (#869)

v0.18.5

Merge PR: gas limit buffer (#864)

* add gas limit buffer

* bump version to v0.18.5

* update default gas price to 0.1gwei

v0.18.3.1

Merge PR: update default gas price (#862)

v0.18.4

Merge PR: limit the websocket connection number (#855)

* finish the demo

* optimize log

* add a connection pool used for limiting the connection number

* add a flag used for controlling the subscription channel length

* opitimize the name

* opitimize the log

* remove a todo

* change version

v0.18.3

Merge PR：Bump version to v0.18.3 (#848)

* fix inconsistent bytecode via call eth_getCode

* Bump version to v0.18.3

v0.18.2

Merge PR: Bump version to v0.18.2 (#845)

v0.18.1

Merge PR: bump to v0.18.1 (#844)

v0.18.0

Merge PR: add v018 migrate (#833)

* add migrate v017

* add migrate v017

* add migrate v017 to v018

* add migrate v017 to v018

Co-authored-by: shaoyun.zhan@okcoin.com <shaoyun.zhan@okcoin.com>
Co-authored-by: Zhong Qiu <36867992+zhongqiuwood@users.noreply.github.com>