update more 0.7 deprecations

[Evizero]

fixes #98

[Evizero]

I also sketched out the project file, but it doesn't quite work yet because dependencies don't have one yet (I think). Anyway I am checking it in and we can rename it later

[Evizero]

Seems the CI version for 0.7 is a bit behind. As long as it succeeds on nightly it should be fine

[Evizero]

• The decreased coverage is spurious (the code it says isn't executed is literally shown in the logs to be executed)

• The remaining warnings about precompile are not from LossFunctions but from dependencies.

[joshday]

My understanding is that there will be some automated process that will add project files to all Julia repos, so we may not have to worry about that ourselves.

[Evizero]

Right. The reason I tried anyway was because initially i got weird warnings after I added using Markdown, even though its a stdlib which AFAIK we should not put into REQUIRE.

┌ Warning: Package LossFunctions does not have Markdown in its dependencies:
│ - If you have LossFunctions checked out for development and have
│   added Markdown as a dependency but haven't updated your primary
│   environment's manifest file, try `Pkg.resolve()`.
│ - Otherwise you may need to report an issue with LossFunctions
└ Loading Markdown into LossFunctions from project dependency, future warnings for LossFunctions are suppressed.