rcoreoa 0.4.0

core_articles_dedup() function added for article deduplication (#23)
core_advanced_search() overhauled because the CORE advanced search fields and syntax have completely changed. The interface changed from passing in a data.frame because we needed more flexibility to let users define how to combine multiple queries (#20)

using vcr for test suite http request caching (#21)
add max value of limit (number of records per request) parameter to documentation (#18)

rcoreoa 0.3.0

gains new methods core_articles_search() and core_articles_search_() for searching for articles (#15)
gains new manual file ?core_cache for an overview of caching
package hoardr now used for managing file caching (#13)
function core_advanced_search() gains support for the language filter (#16) thanks @chreman

support for passing in more than one journal/article/etc. identifier for core_articles_pdf()/core_articles_history() - already supported in other functions (#10)
overwrite parameter was being ignored in core_articles_pdf(), now is passed on internally (#12)
parse parameter dropped in core_articles_pdf(), only used internally (#11)
Improved docs on how to get and use API keys (#14)
Improve documentation about what a 404 error response means - that the thing reqeusted does not exist (#9)