Make section and type output match the config file order.

[njsmith]

Fixes gh-70.

[codecov-io]

Codecov Report

Merging #74 into master will increase coverage by 1.57%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #74      +/-   ##
=========================================
+ Coverage   88.73%   90.3%   +1.57%     
=========================================
  Files          12      12              
  Lines         435     454      +19     
  Branches       52      56       +4     
=========================================
+ Hits          386     410      +24     
+ Misses         28      27       -1     
+ Partials       21      17       -4

Impacted Files	Coverage Δ
src/towncrier/test/test_format.py	100% <100%> (ø)	⬆️
src/towncrier/test/test_write.py	100% <100%> (ø)	⬆️
src/towncrier/test/test_cli.py	92.59% <100%> (-7.41%)	⬇️
src/towncrier/_builder.py	100% <100%> (+2.4%)	⬆️
src/towncrier/__init__.py	88.52% <0%> (+4.91%)	⬆️
src/towncrier/_settings.py	80% <0%> (+20%)	⬆️

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