* Add a document about contributing
It is shamelessly stolen from opentelemetry-python and edited to be
relevant to opentelemetry-go. This file should explain some less
obvious things about the development of the project, like running
linters and regenerating the files.
* Force the use of go modules
Until go 1.13 modules were disabled by default if the repository was
inside GOPATH. This was causing issues when running `make precommit`
for the first time, as it could not find sources for any of the tools
used in `make precommit` under `${GOPATH}/src`. With setting the
`GO111MODULE` environment variable to `on`, we tell `go` to behave
differently, just like go 1.13 does by default.
* Remove globals from exp/streaming
* basic example
* Build the streaming example
* Update README.md for running streaming example
* Remove observer package
* Move observer to exporter
* Fix
* Re-run make circle-ci
Enabling misspell and goimports in golangci-lint allows a bit of
simplification of tools.go / Makefile.
The linters enabled locally also complained about the markdown in
README.md a little, so I fixed those complaints.
I also enabled auto-fix mode in golangci-lint so that it will just
fix any lint issues it runs across (which is how goimports/misspell)
was being used.
misspell still needs to be included in tools.go unless we decide that
we didn't want it to run on markdown files.
