Description of problem:
I've run:

  fpaste -i

with text in my clipboard.

Version-Release number of selected component:
fpaste-0.3.9.0-1.fc26

Additional info:
reporter:       libreport-2.9.1
cmdline:        python3 /usr/bin/fpaste -i
crash_function: default
exception_type: TypeError
executable:     /usr/bin/fpaste
kernel:         4.12.5-300.fc26.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
encoder.py:180:default:TypeError: Object of type 'bytes' is not JSON serializable

Traceback (most recent call last):
  File "/usr/bin/fpaste", line 763, in <module>
    main()
  File "/usr/bin/fpaste", line 720, in main
    url = paste(text, options)
  File "/usr/bin/fpaste", line 99, in paste
    'password': options.password}).encode('utf8')
  File "/usr/lib64/python3.6/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/usr/lib64/python3.6/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/lib64/python3.6/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/usr/lib64/python3.6/json/encoder.py", line 180, in default
    o.__class__.__name__)
TypeError: Object of type 'bytes' is not JSON serializable

Local variables in innermost frame:
o: b'Name:           clamav-data-nightly\nSummary:        Virus signature data for the Clam Antivirus scanner nightly update\nVersion:        %(date +%Y.%m.%d)\nRelease:        1%{?dist}\nLicense:        GPLv2\nURL:            http://www.clamav.net\nBuildArch:      noarch\n\n# empty file to make it work (not sure if better way)\nSource0:        dummy\n\n%global homedir %{_var}/lib/clamav\n\nBuildRequires:  /usr/bin/freshclam\n\nRequires:  clamav-filesystem\nProvides:  data(clamav) = full\n\nProvides:  clamav-data\nConflicts: clamav-data\n\n\n%description\nNightly updated clamav data. Just a demo realy so far.\n\n\n%prep\n%setup -q -c -T %{name}-%{version}\n\n\n%build\nfreshclam --datadir=. --show-progress\n\n\n%install\nmkdir -p %{buildroot}%{homedir}\ncp -p *.cvd %{buildroot}%{homedir}\n\n\n%files\n%config %verify(not size md5 mtime) %{homedir}/*.cvd\n\n\n%changelog\n'
self: <json.encoder.JSONEncoder object at 0x7f3114f9f4e0>