update to BioSymbols 4.0, BioSequences 2.0, add FASTX

[cecileane]

No description provided.

[coveralls]

Coverage increased (+0.06%) to 84.462% when pulling 17bbd4f on bioup into ede94c5 on master.

[codecov]

Codecov Report

Merging #132 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   84.40%   84.46%   +0.05%     
==========================================
  Files          28       28              
  Lines       10259    10259              
==========================================
+ Hits         8659     8665       +6     
+ Misses       1600     1594       -6     

Impacted Files	Coverage Δ
src/PhyloNetworks.jl	100.00% <ø> (ø)
src/substitutionModels.jl	93.14% <ø> (ø)
src/parsimony.jl	87.47% <100.00%> (ø)
src/phyLiNCoptimization.jl	94.10% <0.00%> (+0.90%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ede94c5...17bbd4f. Read the comment docs.