Add eof() function

[xue-cheng]

make eof() support FortranFile

[codecov-io]

Codecov Report

Merging #5 into master will decrease coverage by 0.34%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
- Coverage   96.44%   96.09%   -0.35%     
==========================================
  Files          10       10              
  Lines         281      282       +1     
==========================================
  Hits          271      271              
- Misses         10       11       +1

Impacted Files	Coverage Δ
src/file.jl	75% <0%> (-3.95%)	⬇️

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[coveralls]

Coverage decreased (-0.3%) to 80.0% when pulling e139915 on xue-cheng:master into e7834c8 on traktofon:master.

[coveralls]

Coverage decreased (-0.3%) to 80.0% when pulling e139915 on xue-cheng:master into e7834c8 on traktofon:master.

[traktofon]

Thanks, this looks ok. I will add some tests before making a release.