Correct publish script

• Fix bug with publish script

Drop support for old Go versions

• Minimum Go version 1.18 is required.

Sunset support for older go versions than 1.16

• min Go version 1.16 required

Go mod and drop support for old go versions

• adds go mod support and now the minimum Go version required in 1.12.
• switched to Github actions

Fix Etag format

The release will fix a bug with format of an Etag:

• ETag are expecting to be enclosed in quotes.

Simplify

Simplify SHA1 generation code and add tests

Initial release

0.0.1

add readme