Fix renderer Cargo feature and fix links to docs.rs (#91)

* Fix renderer not working without the viewer feature.; Fix

* Fix docs-rs links for model editing type aliases.

Version and changelog

Merge pull request #87 from davidhozic/develop

Merge v2.0.0 features

Bump version

Fix segmentation fault on invalid model specification (#67)

* Fix spelling

* Add missing `MjSpec` named accessors (bug #63) (#64)

* Add missing accessors (bug #63)

* Fix documentation

* Fix array not being null terminated.

* Fix segmentation fault.

* Remove duplication

Add missing `MjSpec` named accessors (bug #63) (#64)

* Add missing accessors (bug #63)

* Fix documentation

Fix GLFW dependencies (#60)

* Change glfw-dep to the patched version

* Changed import

* Changelog

* Remove unnecessary space

* Refactor docs

Replace unneeded ffi() call with opt()

Bump version

README example; CHANGELOG

Bump version