 Fix parsing success check for simdjson's json_parse in allparserscheckfile.cpp and minor cleanup (#141)
 Fix parsing success check for simdjson's json_parse in allparserscheckfile.cpp and minor cleanup (#141)

* Fix parsing success check for simdjson's json_parse

* Remove trailing whitespace

* Remove redundant using declarations

lemire/simdjson,lemire/simdjson,lemire/simdjson,lemire/simdjson,lemire/simdjson,lemire/simdjson