coronavirus 0.3.0

Added the refresh_coronavirus_jhu function for pulling the coronavirus dataset using the covid19R project format
Created docker image for development environment and cron job, more info available here
Updated the update_dataset function

coronavirus 0.2.0

Data changes:
- coronavirus dataset - Change the structure of the US data from March 23rd 2020 and forward. The US data is now available on an agregated level. More information about the changes on the raw data available on this issue
- Changes in the columns names and order:
  - Province.State changed to province
  - Country.Region changed to country
  - Lat changed to lat
  - Long changed to long
- The covid_south_korea and covid_iran that were avialble on the dev version were removed from the package and moved to new package covid19wiki, for now available only on Github
Function:
- update_dataset - enable to update the installed version with new data that available on the Github version
Data refresh - the Github version is now updated on a daily basis with a cron job