The regex in `parseGoVersionFile()` didn't consider rc and beta
versions. The regex has been extended.
In `findMatch()` the match is checked using `semver.satisfies()`. But
`semver.satisfies()` doesn't no about Go's non-semver rc and beta
version formats (1.16c1 instead of 1.16.0-rc.1).
We cannot use `makeSemver()` on `versionSpec` and compare the result
using `semver.satisfies()` because `versionSpec` could be, well, a
spec. Instead we first check if there is a strict match between the
candidate version and the versionSpec.
Fixes#525.
* get latest release for .x syntax version
* added nock as dev dependency
* added test for .x syntax
* updated readme
* updated http client name
* use rest client for getting available versions
* more .x handling
* move nock to setup and teardown
