0.4.0

compiler
- switch to the hardfloat ABI on ARM, which is more widely used
- avoid a dependency on objcopy (arm-none-eabi-objcopy etc.)
- fix a bug in make([]T, n) where n is 64-bits on a 32-bit platform
- adapt to a change in the AVR backend in LLVM 8
- directly support the .uf2 firmware format as used on Adafruit boards
- fix a bug when calling panic() at init time outside of the main package
- implement nil checks, which results in a ~5% increase in code size
- inline slice bounds checking, which results in a ~1% decrease in code size
targets
- samd21: fix a bug in port B pins
- samd21: implement SPI peripheral
- samd21: implement ADC peripheral
- stm32: fix a bug in timekeeping
- wasm: fix a bug in wasm_exec.js that caused corruption in linear memory when running on Node.js.

0.3.0

compiler
- remove old -initinterp flag
- add support for macOS
cgo
- add support for bool/float/complex types
standard library
- device/arm: add support to disable/enable hardware interrupts
- machine: add CPU frequency for nrf-based boards
- syscall: add support for darwin/amd64
targets
- circuitplay_express: add support for this board
- microbit: add regular pin constants
- samd21: fix time function for goroutine support
- samd21: add support for USB-CDC (serial over USB)
- samd21: add support for pins in port B
- samd21: add support for pullup and pulldown pins
- wasm: add support for Safari in example

command line
- add version subcommand
compiler
- fix a bug in floating point comparisons with NaN values
- fix a bug when calling panic in package initialization code
- add support for comparing complex64 and complex128
cgo
- add support for external globals
- add support for pointers and function pointers
standard library
- fmt: initial support, fmt.Println works
- math: support for most/all functions
- os: initial support (only stdin/stdout/stderr)
- reflect: initial support
- syscall: add support for amd64, arm, and arm64