* Introduce a top-level `Version()` and `SemVersion()` function.
These are intended to be used by submodules within the repo that need
to specify an "instrumentation version" when creating a tracer or meter.
* Included PR number in CHANGELOG
* Update contrib.go
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
* use predeclared constant regex
* Add comment about how/when Version() string is updated
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
ET