add the option for json.dumps to return newline delimited json

GitHub fields:

assignee = 'https://github.com/etrepum'
closed_at = None
created_at = <Date 2018-08-28.12:47:12.716>
labels = ['3.8', 'type-feature', 'library']
title = 'add the option for json.dumps to return newline delimited json'
updated_at = <Date 2019-08-18.21:49:41.600>
user = 'https://bugs.python.org/ronron'

bugs.python.org fields:

activity = <Date 2019-08-18.21:49:41.600>
actor = 'Thibault Molleman'
assignee = 'bob.ippolito'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-08-28.12:47:12.716>
creator = 'ronron'
dependencies = []
files = []
hgrepos = []
issue_num = 34529
keywords = []
message_count = 10.0
messages = ['324244', '324257', '324271', '324305', '324358', '324360', '324363', '324370', '324371', '324475']
nosy_count = 6.0
nosy_names = ['rhettinger', 'bob.ippolito', 'serhiy.storchaka', 'enedil', 'ronron', 'Thibault Molleman']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue34529'
versions = ['Python 3.8']