Correct Documenter bug

[gdalle]

My last PR #16 had a faulty Documenter import, this fixes that.

[codecov]

Codecov Report

Merging #19 (b5d7ea8) into master (e7d9761) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #19   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          227       227           
=========================================
  Hits           227       227           

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[bramtayl]

I tend to like to only import exactly what I need, in this case, something like:

using Documenter: deploydocs, HTML, makedocs

would work, but this also works

[gdalle]

I tend to like to only import exactly what I need, in this case, something like:

using Documenter: deploydocs, HTML, makedocs

would work, but this also works

I modified the file accordingly :)