Renamed binary to be desmos

[RiccardoM]

Description

Renamed binary from desmosd to desmos. Closes #342.

Checklist

• Targeted PR against correct branch.
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Wrote unit tests.
• Wrote integration tests (simulation & CLI).
• Updated the documentation.
• Added an entry to the CHANGELOG.md file.
• Re-reviewed Files changed in the Github PR explorer.

[codecov]

Codecov Report

Merging #343 (cf84812) into master (1fcdb0b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #343   +/-   ##
=======================================
  Coverage   82.03%   82.03%           
=======================================
  Files          99       99           
  Lines        3758     3758           
=======================================
  Hits         3083     3083           
  Misses        564      564           
  Partials      111      111           

Impacted Files	Coverage Δ
app/app.go	84.84% <100.00%> (ø)

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