Merge pull request #81 from aburrell/rc_v2.6.3

Release Candidate version 2.6.3

Merge pull request #66 from aburrell/rc_26.2

Release Candidate for v2.6.2

BUG: fixed long description content type

Long description content type should be x-rst.  Determined after testing on pypi legacy.

Merge pull request #48 from aburrell/develop

Version 2.6 Update.  This update incorporates the new C code (v2.6), which has coefficients recalculated using IGRF13.

Merge pull request #46 from aburrell/develop

Version 2.5.3 Release

Merge pull request #40 from aburrell/develop

Version 2.5.2 release which includes:
- FutureWarning on depreciated functions
- No logbook dependency
- Updated version support
- Warnings for very high altitudes
- Better environment variable setting logic

Moved pull request template

Found a similar issue on StackOverflow that suggested multiple templates for pull requests aren't working yet.  Trying this to see if the template will show up.

Merge pull request #23 from aburrell/develop

Version 2.5.0 Release.  Only codacy failing.

Merge pull request #20 from aburrell/develop

convert_mlt bug

Update changelog

Update changelog to reflect changes made in last push, and change to be
made in the next push (adding the DOI).