v0.3.0

MomentOpt v0.3.0

Diff since v0.2.0

Merged pull requests:

• Tw/expr (#18) (@tweisser)
• Tw/approximate (#19) (@tweisser)
• Bump Documenter to v0.27 (#22) (@blegat)
• Switch from travis to Github CI (#23) (@blegat)
• Update to JuMP v1 (#25) (@blegat)
• Update to MultivariatePolynomials v0.5 (#26) (@blegat)

Closed issues:

• ERROR: UndefVarError: add_constraint not defined (#20)
• Updates (#24)