Squashed commit of the following (pr #161):
commit 58235a99b04a975d825f4f8f8431a6dcb7acccdc
Author: AndCycle <andcycle@andcycle.idv.tw>
Date: Thu Aug 16 17:57:26 2018 +0800
doc: proper fix rst syntax
commit 6620e3583c0b59e9447bcc44e5f573c61d02e6de
Author: AndCycle <andcycle@andcycle.idv.tw>
Date: Thu Aug 16 17:29:25 2018 +0800
doc: fix syntax
commit 7a048a3c0440ad900917eb865b72dcfb348da879
Author: AndCycle <andcycle@andcycle.idv.tw>
Date: Thu Aug 16 17:09:26 2018 +0800
doc: add info about read args from file.
commit c4ceaf96365422f25357c54af03aadfa7222ce44
Author: AndCycle <andcycle@andcycle.idv.tw>
Date: Thu Aug 16 17:05:07 2018 +0800
alter `fromfile_prefix_chars` to plus sign to avoid conflict.
commit d469b52b95de6bf86761b9315a78ecda2b033ac2
Author: AndCycle <andcycle@andcycle.idv.tw>
Date: Mon Aug 6 19:10:23 2018 +0800
* Allow reading arguments from file
function referenced from instagram-scraper,
which provide a convenient way to hide sensitive information.
