Change rpc version 5.5.9. (sofastack#785)

Prepare release 5.5.8. (sofastack#772)

Fix generic invoke method name print. (sofastack#768)

Add missed event register of lookout. (sofastack#746)

Prepare release 557. (sofastack#741)

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)