v0.1.20

• json methods

v0.1.18

• concatenation
• truncate in place
• parse strings with a custom function
• refuse to add column if already exists
• clone/pop series return some/none,
• get_series

v0.1.17

• horizontal join

v0.1.16

• basic math functions
• custom apply
• stringify
• clone series
• parse moved to generics

v0.1.11

v0.1.11