pub use instead of type to expose LinuxI2CMessage for docs

The type alias means that the methods like `with_address` and
`with_flags` are not shown in the documentation.

Author: kevinmehall

src/ffi.rs

@@ -19,6 +19,7 @@ use std::ptr;
 
 pub type I2CError = nix::Error;
 
+/// Linux I2C message
 #[repr(C)]
 pub struct i2c_msg<'a> {
     /// slave address

src/linux.rs

@@ -316,8 +316,7 @@ impl LinuxI2CBus {
     }
 }
 
-/// Linux I2C message
-pub type LinuxI2CMessage<'a> = ffi::i2c_msg<'a>;
+pub use ffi::i2c_msg as LinuxI2CMessage;
 
 impl<'a> I2CTransfer<'a> for LinuxI2CBus {
     type Error = LinuxI2CError;