Package properties are missing a license value

[AndrewJanuary]

Minor and perhaps a bit pedantic. However this is probably useful for users who want to check the license type of their currently installed Octopose package locally (rather than relying on checking the repo or documentation). I think we can just add it here during the package setup: https://github.com/HuddleEng/octopose/blob/master/setup.py#L38-L41

Replication Steps

1. Run pip show octopose
2. Check the output
   Actual: License property has a value of 'unknown'
   Expected: The License property has a value which matches the current Octopose license type (currently MIT)

[AndrewJanuary]

Closing. Fixed in v0.2.4. Further improvements in v0.2.5.