[README] Still needs work :-(

[DazWilkin]

Thanks for refining the guide in response to #445.

I tried following the revised instructions but I'm unable to get the code to work using them and reverting to running the docker images on the release page.

I appear to minimally need Bazaar (bzr):

make agent
GO111MODULE=on CGO_ENABLED=0 go build -o ./bin/ocagent_linux -ldflags "-X github.com/census-instrumentation/opencensus-service/internal/version.GitHash=5d4aea2 " ./cmd/ocagent
go: labix.org/v2/mgo@v0.0.0-20140701140051-000000000287: bzr branch --use-existing-dir https://launchpad.net/mgo/v2 . in ... ea8: exec: "bzr": executable file not found in $PATH
go: launchpad.net/gocheck@v0.0.0-20140225173054-000000000087: bzr branch --use-existing-dir https://launchpad.net/~niemeyer/gocheck/trunk . in ...: exec: "bzr": executable file not found in $PATH
go: error loading module requirements
Makefile:55: recipe for target 'agent' failed
make: *** [agent] Error 1

[pjanotti]

Thanks @DazWilkin - yes, unfortunately bzr is a requirement via some indirect dependency. Since I see that you are giving a good spin on the agent let me group these issues so I can try to go in one pass.

[flands]

Updated README