Bump objc crate to 0.2.7

Added a changelog entry for version 0.2.6

Bump objc crate to 0.2.5

Bump objc crate to 0.2.4

Added a changelog entry for version 0.2.3

Added a changelog entry for version 0.2.2.

Bump objc crate to 0.2.1.

Remove the unused encode! macro.

Bump objc crate to 0.1.8.

Bump objc crate to 0.1.7.