== 0.8.1 / 2017-07-18
* Do not include optional headers in #missing_headers
* Improve string parsing to strip trailing '.0' from incoming float values
* Add #to_h to Row for consistency with Column
* Bugfix for calls to #add_error with invalid calling signature

== 0.8.0 / 2017-06-29
* Breaking Change: change signature of Importer#add_error to support new features
* Breaking Change: Importer.missing_headers will be [] instead of nil on all headers found
* Breaking Change: remove deprecated method Column#required!
* Add Importer#rows to directly access rows post-import
* Add Column#optional! to enable non-mandatory columns during header detection
* Add Column#present? and Column#missing? to test for presence after import attempt
* Add Importer#validate_columns to allow detecting invalid column combinations
* Add Importer#validate_rows to allow whole-row validation
* Add Importer#virtual_column and Column#calculate to enable virtual columns
* Track actual header text found for columns
* Update Column#to_s to use actual header text when present
* Revamp error tracking significantly to provide better reporting ability
* Improve error tracking to include row/column when knowable
* Improve error tracking to include problem values when knowable
* Add Column#error_values to return unique raw error values by column
* Add Column#error_values? which will be true when there is at least one error value for the column
* Add Row#error_map to return map of column key => raw value for each row
* Change Column#parse block processing to allow explicit #add_error call
* Change Column#validate block processing to allow explicit #add_error call and to add an implicit error on returned false

== 0.7.0 / 2017-02-16

* Breaking Change: Removed multi-sheet support - use multiple importers instead
* Breaking Change: Removed warnings as they were confusing and not being used
* Deprecate Column#required! due to bugginess and overlap with Column#validate
* Add new HtmlReader support to handle parsing HTML <table> rows
* Add Importer#scope to allow narrowing the search to one or more sheets/tables when importing
* Modify Importer#import to support block mode combining #import and #process
* Add Importer#import_string for handling explicit CSV/HTML/Custom text
* Add Importer#on_error(&block) to allow inline conditional error handling
* Improve error message when headers can't be detected to list missing headers
* Change Importer#error_summary to group identical errors into single summary line
* Improve :cents type column rounding to better handle floating point ugliness
* Much improved test coverage and documentation

== 0.6.1 / 2015-08-24

* Better handling for nil return value in custom format readers

== 0.6.0 / 2015-08-17

* Refactored readers to allow for custom format reading
* Vastly improved internal and user-facing comments
* Improved error logging, replaced some exceptions with errors

== 0.5.0 / 2015-03-19

* Initial revision
* Support for CSV, XLS and XLSX importing
* Multiple sheet support
* Automatic header and start-of-data detection
* Value coercion to :string, :integer, :float, :date, and :cents
* Custom parsing of raw cell values
* Custom validation of cell values
* Conditional row filtering
* Error and warning aggregation, by sheet/row as appropriate
* Automatic stream-to-file conversion where needed by underlying libs