fix release failed. (sofastack#686)

Fix travis ci dist. (sofastack#667)

Release 5.5.5. (sofastack#661)

Prepare to release 554. (sofastack#641)

* prepare release 554

* prepare release 554

* trigger ci

Prepare to release 5.5.3. (sofastack#607)

Change rpc to 552. (sofastack#566)

Update rpc to 5.5.1 to prepare release. (sofastack#524)

Prepare release 550 (sofastack#463)

* update version to 5.5.0

* update hessian to 3.3.4

* update version to 5.5.0

* change mesh version

Optimize imports and authors. (sofastack#392)

Change version bolt (sofastack#345)

* change jackson and bolt version

* change jackson and bolt version