New rule: no-fx

[edg2s]

In slim mode, $.fx is completely missing, so create a rule
for this (more generic that no-fx-interval, which exists as
that property is deprecated).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5fc1937) to head (442d418).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #340   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          104       105    +1     
  Lines          625       631    +6     
=========================================
+ Hits           625       631    +6     

Files with missing lines	Coverage Δ
src/index.js	100.00% <ø> (ø)
src/rules/no-fx.js	100.00% <100.00%> (ø)

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