WIP - Detect Forth over F#

[gandarez]

This PR fixes the detection for Forth language over F#.

alecthomas/chroma#1080

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 62.53%. Comparing base (ab3d4e7) to head (4330bc6).

Files with missing lines	Patch %	Lines
pkg/language/language.go	63.63%	3 Missing and 1 partial ⚠️

@@             Coverage Diff             @@
##           develop    #1173      +/-   ##
===========================================
+ Coverage    62.45%   62.53%   +0.07%     
===========================================
  Files          388      386       -2     
  Lines        17074    17019      -55     
===========================================
- Hits         10664    10642      -22     
+ Misses        5835     5813      -22     
+ Partials       575      564      -11     

Flag	Coverage Δ
unittests	62.53% <75.00%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/language/priority.go	100.00% <100.00%> (ø)
pkg/language/language.go	85.50% <63.63%> (+4.78%)	⬆️

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