* Smaller & safer Docker build context
* Help imaginary avoid having root at runtime
* Enable libvips' support for libimagequant
* Add libheif / HEIC image support
* Replace Dep by Go Modules
Code refactoring (switch, gofmt, ...)
Update libvips to 8.8.1 and go to 1.12.9
Use Debian Buster on Dockerfile
* Add GOLANG_VERSION to build args
Currently all tests done by TravisCI run on the same Go version regardless of the matrix
* Remove Go 1.10 from Travis matrix (Go modules require 1.11+)
* Update README.md Prerequisites
* Ignore Hash.Write() errors
Daniel Dent