Fix vecdot issue with new StaticArrays versions.

Fully switch to Project.toml setup.

Upgrade to MathOptInterface 0.8.x.

• Fix SVector * Number optimization
• Add prune_zero and prune_zero!

• Recognize constant constraint functions, skip update step for such constraints
• Add support for quadratic constraints
• Add support for function * vector

Update to MathOptInterface 0.6 (#91).

• add basic Documenter documentation (#87)
• add canonicalize / canonicalize! (#86)
• extend dot to higher-dimensional arrays (#85, thanks @timholy)
• switch from MockModel() (which produced an object of a type completely separate from Model) to mock_model() (which produces a Model with an MOIU.MockOptimizer as the optimizer)

• drop support for Julia 0.6 (#82)
• treat Model as a scalar in broadcast calls (#79, thanks @timholy)
• add Parameter(model, val=X) syntax (#84, fixes #67)

Add support for Julia 1.0 and MathOptInterface 0.5.

Mixed-integer support is not tested on Julia 1.0 on this version due to the current lack of a 1.0-compatible release of a MathOptInterface-supported mixed-integer solver. This should be resolved by JuliaLang/METADATA.jl#17884 and a new GLPK tag.

Initial release.