Enhancements
- Travis-CI testing and PyPi deployment ([issue-1][])
- Added function to change slope
- Write slices of `data_array` ([issue-3][])
- Add test for writing slice ([issue-4][])
- Changed to uppercase `.HDR` and `.DAT`
- Remove voice memo when saving slice ([issue-7][])
Bug Fixes
- Use Windows carriage returns in `.HDR` file ([issue-5][])