CompatHelper: bump compat for FASTX to 2, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the FASTX package from 1.1 to 1.1, 2.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

Merging #183 (1277b7c) into master (6cda01e) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
- Coverage   85.97%   85.95%   -0.03%     
==========================================
  Files          29       29              
  Lines       11824    12479     +655     
==========================================
+ Hits        10166    10726     +560     
- Misses       1658     1753      +95     

Impacted Files	Coverage Δ
src/graph_components.jl	98.94% <0.00%> (-1.06%)	⬇️
src/undo.jl	87.50% <0.00%> (-0.97%)	⬇️
src/pairwiseDistanceLS.jl	95.70% <0.00%> (-0.93%)	⬇️
src/bootstrap.jl	70.26% <0.00%> (-0.74%)	⬇️
src/readwrite.jl	80.69% <0.00%> (-0.58%)	⬇️
src/moves_snaq.jl	79.28% <0.00%> (-0.47%)	⬇️
src/addHybrid_snaq.jl	60.33% <0.00%> (-0.27%)	⬇️
src/substitutionModels.jl	93.82% <0.00%> (-0.25%)	⬇️
src/snaq_optimization.jl	74.83% <0.00%> (-0.22%)	⬇️
src/traits.jl	96.86% <0.00%> (-0.15%)	⬇️
... and 18 more

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