vendor: update all dependencies

* Update all dependencies
  * Remove all `[[constraint]]` from Gopkg.toml
  * Add in the minimum number of `[[override]]` to build
  * Remove go get of github.com/inconshreveable/mousetrap as it is vendored
  * Update docs with new policy on constraints

vendor/cloud.google.com/go/bigquery/copy.go

@@ -100,7 +100,7 @@ func (c *Copier) Run(ctx context.Context) (*Job, error) {
 
 func (c *Copier) newJob() *bq.Job {
 	return &bq.Job{
-		JobReference:  c.JobIDConfig.createJobRef(c.c.projectID),
+		JobReference:  c.JobIDConfig.createJobRef(c.c),
 		Configuration: c.CopyConfig.toBQ(),
 	}
 }