Add support for Project.toml

Also:

• Deprecate REQUIRE file.
• Remove support for Julia < 1.0.

Control Trace Visibility

v0.3.4

Allow for basic control of trace visibility.

Better support for Julia 1.0

Fix a few lingering bugs & improve compatibility with Plots.jl.

Tests now work in Julia 1.0.

v0.3.2

Deprecate axes().

Improved support for Julia v0.7

Fix bug with findfirst & use @warn, @info.

Also fix issue testing with TravisCI.

Migrate to Julia v0.7

v0.3.0

Migrate travis to Julia v0.7.