Updates to documentation.
Improvements to API key handling so that API keys are checked for on package load.
Increased test coverage
Creation of generic download function to ease code maintenance
Tweaks to error messages
Fixed #1, where ifelse() stripping attributes from variables caused errors
in fixer_historical() (thanks @mhasanbulli).
Added error messages to fixer_convert() for amounts >=100,000 and <=0.
Added conversion from UNIX time to yyyy-mm-dd HH:mm:ss for fixer_convert().
Improved date handling in fixer_fluctuation() and fixer_time_series().
Increased test scenarios.
Fixed bug with fixer_convert() data parameter.
Improved code coverage and documentation
fixer_account_type() now sets account type as "free" unless "paid"
is used as a parameter, rather than giving an error.
Removed need to declare account type
Fixed error that broke entire fixer_convert() function
Included proper citation information
Fixed some spelling mistakes and improved clarity of vignette text
First package release.
Added a NEWS.md file to track changes to the package.