v5.5.15: Update dependencies (#182)

* Git ignore go vendor folder

* Update go dependencies

v5.4.19

fix race and parityshard leaks

bugfix in fastack needless transfer

v5.4.10

reset fastack = 0 to prevent from sending needless data

v5.4.5

more accurate write block

v5.4.2

bug fix

v5.4.1

fix sendmmsg/recvmmsg compatibility issue for old linux kernel

v5.3.9

bug fix

v5.3.8

rename var

v5.3.7

proper error handling

synchronized batch sending

v5.3.6

correct counting