Make sure we join() bytes

[codecov-io]

Codecov Report

Merging #163 into master will decrease coverage by 0.15%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
- Coverage   97.05%   96.89%   -0.16%     
==========================================
  Files          25       25              
  Lines        2991     2580     -411     
  Branches      271      238      -33     
==========================================
- Hits         2903     2500     -403     
+ Misses         56       49       -7     
+ Partials       32       31       -1

Impacted Files	Coverage Δ
src/txkube/test/test_authentication.py	100% <100%> (ø)	:arrow_up:
src/txkube/test/test_network.py	97.48% <0%> (-0.22%)	:arrow_down:
src/txkube/_authentication.py	97.22% <0%> (-0.03%)	:arrow_down:
src/txkube/_model.py	95.73% <0%> (-0.03%)	:arrow_down:
src/txkube/testing/integration.py	95.34% <0%> (-0.02%)	:arrow_down:
src/txkube/testing/__init__.py	100% <0%> (ø)	:arrow_up:
src/txkube/_network.py	97.22% <0%> (+0.21%)	:arrow_up:

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[exarkun]

Thanks. Looks good. Merging.