Explicitly specifies the logo's width and height

[zgosalvez]

This allows us to use a logo that is 2x, i.e., 460 x 104, which will look better on retina displays (Macs).

[codecov-io]

Codecov Report

Merging #29 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #29   +/-   ##
=======================================
  Coverage   88.52%   88.52%           
=======================================
  Files           2        2           
  Lines          61       61           
=======================================
  Hits           54       54           
  Misses          7        7           

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[zgosalvez]

I actually prefer #17 instead of this. Sorry, I just saw that now. I can close this if @mpociot pulls that. I hope he does since the low-resolution logo is really ugly on HiDPI displays.