Build from source documentation needs to be updated

[shaneHowearth]

Trying to build endly with an older version of go produces

$ go build
build github.com/viant/endly/endly: cannot load embed: malformed module path "embed": missing dot in first path element

Embed was first released in 1.16 (I think) https://golang.org/doc/go1.16#library-embed
So, endly can no longer be built by versions of Go older than 1.16 (I get that versions older than that may not be supported, but the documentation says 1.11 or later, which is now incorrect)

[adranwit]

Updated afs dependency so it should build with go1.11

[shaneHowearth]

Thanks, tested with 1.13.15 linux/amd64 and am now able to build

[adranwit]

Thanks for raising the issue