[FR] Normalise versioning tags to vX.Y.Z

[toni-moreno]

In order to use snmpcollector engine as a library to develop specific tools we will need to add to our tool projects with

$ go get github.com/toni-moreno/snmpcollector@{version}

without standar versioning we will see:

$ go get github.com/toni-moreno/snmpcollector@0.12.0 
go: downloading github.com/toni-moreno/snmpcollector v0.0.0-20211114143514-4abc9f12449c
go get: added github.com/toni-moreno/snmpcollector v0.0.0-20211114143514-4abc9f12449c

while is tagged as 0.12.0 go modules see our project as v0.0.0

We should begin to work with standard versioning https://golang.org/doc/modules/version-numbers