[INFRA] Drop gcc7+8

[eseiler]

No description provided.

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[codecov]

Codecov Report

Merging #2891 (81cfebb) into master (dced095) will decrease coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2891      +/-   ##
==========================================
- Coverage   98.36%   98.17%   -0.20%     
==========================================
  Files         277      266      -11     
  Lines       10981    10839     -142     
==========================================
- Hits        10802    10641     -161     
- Misses        179      198      +19     

Impacted Files	Coverage Δ
...ment/aligned_sequence/aligned_sequence_concept.hpp	100.00% <ø> (ø)
.../seqan3/alignment/matrix/detail/matrix_concept.hpp	100.00% <ø> (ø)
...clude/seqan3/alphabet/aminoacid/aminoacid_base.hpp	100.00% <ø> (ø)
...ude/seqan3/alphabet/composite/alphabet_variant.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/concept.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/nucleotide/concept.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/nucleotide/rna15.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/nucleotide/rna4.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/nucleotide/rna5.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/quality/concept.hpp	100.00% <ø> (ø)
... and 186 more

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[SGSSGene]

[smehringer]

Lgtm. Why do we have the Travis file again?

[eseiler]

Lgtm. Why do we have the Travis file again?

They offer to run CI on different architectures; but I'll have to check if it's still running at all 🙃