fix stackdriver json payload bugs

update module path

use openbsd isc license

add json payload stackdriver option

remove api key from client

update dependencies

fix unveil bugs, permission bits

add stackdriver, openbsd protections, refactor using targets

update dependencies

add HTTPClient interface

use cleanhttp to solve file descriptor bug

fix deadlock, http resp body leak, remove log streaming

remove old todo

simplify handler function signature

fix data race

upgrade up dependency

increase client timeout

improve client api

add client buffering

improve concurrency, error handling