isard 0.2.0

• Fix character encoding issues in G-W system for country names. See issue on Github.
• Related: change column names in panel data to better conform to names in the system data.
• cw_democracy and gw_democracy updated to more recent data.
• gw_cw_panel and cw_gw_panel updated to most recently concluded calendar year.

isard 0.1.0

Initial development offering.