Configure hostname

[jcbf]

Implementation of #39

[codecov]

Codecov Report

Merging #40 into master will decrease coverage by 0.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
- Coverage   86.84%   86.72%   -0.13%     
==========================================
  Files           1        1              
  Lines         479      482       +3     
  Branches      167        0     -167     
==========================================
+ Hits          416      418       +2     
- Misses         63       64       +1

Impacted Files	Coverage Δ
smf-spf.c	86.72% <100%> (-0.13%)	⬇️

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[coveralls]

Coverage decreased (-0.1%) to 86.885% when pulling 113d795 on jcbf/configure-hostname into 9699193 on master.