retarget-io 1.5.0

• Add a new macro CY_RETARGET_IO_NO_FLOAT. When defined, floating point string formatting support will be disabled,
  allowing for flash savings in applications which do not need this functionality.

Retarget I/O 1.4.0

• Add cy_retarget_io_init_fc function to initialize with flow control pins
• Mark mutex as no longer initialized after 'cy_retarget_io_deinit'

Retarget I/O 1.3.0

• Added support for checking whether data is being transmitted and waiting until done before finishing the deinit process
• Added support for using with HAL v1 or v2

Retarget I/O 1.2.0

• Improve error handling
• Add de-initialization of the mutex to cy_retarget_io_deinit
• Update documentation for integration of the library in a RTOS environment.

Retarget I/O 1.1.1

• Minor update for documentation & branding

Retarget I/O 1.1.0

• Implemented system I/O retarget functions specific to ARM Compiler 6.
• Made _write implementation thread-safe for Newlib.

Retarget I/O 1.0.0

Initial release to retarget the standard input/output (STDIO) messages to a UART port