v6.0.0 release

## [6.0.0] - 2023-08-30
Fixed several major typos and fortran array ordering issues in tkfram, zzdynrot as well as failing tests on arm64 macos. 
### Added
- SpiceNOTENOUGHDATA2 exception #466
- Context manager for SPICE kernels #458
- CITATION.cff file
- DeprecationWarning for zzdynrot

### Changed
- tkfram_c now used in tkfram wrapper function
- updated setup.cfg
- type hints for sincpt to be more correct

### Deprecated
- python 3.6
- python 3.7

### Removed
- codecov as a dependency in dev

### Fixed
- fixed zzdynrot and tkfram return matrix element ordering
- typo in exceptions.rst #459
- fixed test test_sphlat
- fixed sphlat to use correct libspice function call
- fixed tests for dskx02, dskxsi, gfsntc for arm64 macos floating point issues #470
- fixed typo in test_oscelt and test_oscltx

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to SpiceyPy will be documented here
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project tries to adhere to [Semantic Versioning](http://semver.org/).
 
-## [6.0.0] - 2023-08-30
+## [6.0.0] - 2023-08-31
 Fixed several major typos and fortran array ordering issues in tkfram, zzdynrot as well as failing tests on arm64 macos. 
 ### Added
 - SpiceNOTENOUGHDATA2 exception #466