not sure if you wanted to get rid of `Model` too, happy to revert that one

efficient cronless tagbot trigger

Added vscode gitignore line

add specs for codecov

Extract kinetics-relevant information

Delete Manifest.toml

Manifest.toml is in the .gitignore, but it is in the repo?

...let's see what can be done with it

(((
Should we also take initialConcentration?

What is the purpose of hasOnlySubstanceUnits then when there's both
initialAmount and initialConcentration?
)))

Sanitize string handling, make species' names optional

apply juliaformatter

Improves upon #35

Update README.md

make explicit that pkg is registered in readme

Avoid global namespace creep by `Maybe`

Maybe should *not* be defined by SBML.jl, rather by Base or some other standard
package, but we need it nevertheless. Exporting it means that other packages
will have problems with their own redefinitions of Maybe because name
conflicts. So just do not export it, leave others to redefine it or manually
copy it out, using `const Maybe = SBML.Maybe`.

bump version to 0.3.1

load more useful metadata

(readModel has certainly grown a bit)

read flux bounds and optimization coefficients from FBC extensions