v0.4.0

RosSockets v0.4.0

Closed issues:

• add tests (#1)
• add multi-agent example (#3)
• port 42422 always used for state feedback (#4)
• Unused UDP data isn't discarded unless multi-threading is specifically enabled (#8)
• warm start example solver (#9)

Merged pull requests:

• State feedback (#2) (@jake-levy)
• fix hardcoded port (#5) (@jake-levy)
• Add multi-agent example (#6) (@jake-levy)
• Add testing (#7) (@jake-levy)
• Improve examples/optimal_feedback_control_example.jl (#10) (@jake-levy)
• Change state feedback to TCP connection (#11) (@jake-levy)
• Add general TCP connection (#12) (@jake-levy)
• update compat; add tagbot (#13) (@jake-levy)