Bump TranscodingStreams to 0.10

Drop ReTest test dep

The reason to drop this is:
* To make it more in line with all other BioJulia packages
* To simplify the test file layout. Even though this commit now doesn't
  greatly simplifies it, we can do this in the future
* To not rely on ReTest being maintained
* To not have two separate projects to store test dependencies. Before this
  commit, the deps were stored both in ./Project.toml and test/Project.toml.

Fix: Allow non-PHRED quality scores e.g. Solexa

Solexa FASTQ reads are not PHRED scores, and as such can be negative.
Relax some of the checks regarding qualities.

Update Project.toml version number

Update changelog

See github.com/BioJulia/FASTX.jl/releases/tag/v1.0.0 for release notes