Oscar.jl 0.2.0 released

Today Oscar.jl 0.2.0 has been released.

Diff since v0.1.0

Closed issues:

• Nemo bug? (#54)
• Status of Elliptic Curves package (#75)

Merged pull requests:

• Rational numbers (#74) (@wbhart)
• Install TagBot as a GitHub Action (#78) (@JuliaTagBot)
• Oscar (#79) (@fieker)
• fix .travis.yml (#81) (@fieker)