v3.1.0 SAPM protocol support

This release adds support to export traces using the SAPM protocol

v3.0.0: Go Modules

- Switching to Go modules.  All import paths from this version on should
be `github.com/signalfx/golib/v3/...`.

httpsink honors tokens set in contexts

In addition, automated testing is now only on officially supported go versions of > 1.12 and 1.13.

v2.4.3

• Increase timeout to 10s when querying CPU metadata

v2.3.4

• Add Float32 support to pointers package
• Add Uint64 support to pointers package

v2.3.3

Add function to datapoint package's cast metric values functions

v2.3.2

Logwitherr (#131)

* update vendor deps for assertions, gls, and goconvey for go 1.12 support

* make add log functions for logging if err with log keys

v1.1.6

• add functions for casting interfaces to datapoint values

v1.1.3

• fix bug preventing http2 connections from being established to emit metrics

v1.1.0

• refactor to use built in go library context
• add asynchronous multitoken sink
• add pdbcycle package (multi-file cycledb)

Breaking Changes

This release includes significant refactoring and minor enhancements.
Please note that this library is no longer compatible with go 1.7.x and below.