Add a description to the AsInstanceOf inspection.

[mwz]

It appears that I've missed one.

[codecov-io]

Codecov Report

Merging #330 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #330   +/-   ##
=======================================
  Coverage   86.26%   86.26%           
=======================================
  Files         135      135           
  Lines        1478     1478           
  Branches       27       27           
=======================================
  Hits         1275     1275           
  Misses        203      203           

Impacted Files	Coverage Δ
...sksamuel/scapegoat/inspections/math/UseLog1P.scala	100.00% <ø> (ø)
...amuel/scapegoat/inspections/option/OptionGet.scala	100.00% <ø> (ø)
...el/scapegoat/inspections/unsafe/AsInstanceOf.scala	100.00% <ø> (ø)

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