Update xk6-browser usage example

[inancgumus]

Installation steps in the announcement post were causing issues for our users. So we updated the example in the README before.

However, we used xk6-browser as an executable output for examples in our README and announcement blog post. @ppcano told me that we usually use a k6 executable for extensions.

After talking to @robingustafsson, we decided to use k6 executable output in both examples instead of xk6-browser:

• It would be unfortunate to have high inflation of binary names so I’m ok with changing the readme in the xk6-browser to use k6 binary name.
• It also aligns with the binary name we use of our releases.

So we will update the examples in our README and the announcement blog post.

[inancgumus]

The last release (v0.1.3) is incompatible with k6 v0.36.0:

$ xk6 build v0.36.0 --output xk6-browser --with github.com/grafana/xk6-browser

2022/02/02 11:03:07 [INFO] Temporary folder: /Users/inanc/grafana/k6b/buildenv_2022-02-02-1103.1364873684
2022/02/02 11:03:07 [INFO] Writing main module: /Users/inanc/grafana/k6b/buildenv_2022-02-02-1103.1364873684/main.go
2022/02/02 11:03:07 [INFO] Initializing Go module
2022/02/02 11:03:07 [INFO] exec (timeout=10s): /usr/local/go/bin/go mod init k6
go: creating new go.mod: module k6
go: to add module requirements and sums:
	go mod tidy
2022/02/02 11:03:07 [INFO] Pinning versions
2022/02/02 11:03:07 [INFO] exec (timeout=0s): /usr/local/go/bin/go mod edit -require go.k6.io/k6@v0.36.0
2022/02/02 11:03:07 [INFO] exec (timeout=0s): /usr/local/go/bin/go mod tidy
go: finding module for package github.com/grafana/xk6-browser
go: finding module for package github.com/nxadm/tail
go: found github.com/grafana/xk6-browser in github.com/grafana/xk6-browser v0.1.3
go: found github.com/nxadm/tail in github.com/nxadm/tail v1.4.8
k6 imports
	go.k6.io/k6/cmd imports
	go.k6.io/k6/js imports
	go.k6.io/k6/js/modules/k6/grpc imports
	github.com/golang/protobuf/proto tested by
	github.com/golang/protobuf/proto.test imports
	github.com/google/go-cmp/cmp loaded from github.com/google/go-cmp@v0.5.0,
	but go 1.16 would select v0.5.1
k6 imports
	go.k6.io/k6/cmd imports
	go.k6.io/k6/js imports
	go.k6.io/k6/js/modules/k6/grpc imports
	github.com/golang/protobuf/proto imports
	google.golang.org/protobuf/reflect/protoregistry tested by
	google.golang.org/protobuf/reflect/protoregistry.test imports
	github.com/google/go-cmp/cmp/cmpopts loaded from github.com/google/go-cmp@v0.5.0,
	but go 1.16 would select v0.5.1
k6 imports
	go.k6.io/k6/cmd imports
	go.k6.io/k6/js imports
	go.k6.io/k6/js/modules/k6/grpc imports
	github.com/golang/protobuf/proto tested by
	github.com/golang/protobuf/proto.test imports
	github.com/google/go-cmp/cmp imports
	github.com/google/go-cmp/cmp/internal/diff loaded from github.com/google/go-cmp@v0.5.0,
	but go 1.16 would select v0.5.1
k6 imports
	go.k6.io/k6/cmd imports
	go.k6.io/k6/js imports
	go.k6.io/k6/js/modules/k6/grpc imports
	github.com/golang/protobuf/proto tested by
	github.com/golang/protobuf/proto.test imports
	github.com/google/go-cmp/cmp imports
	github.com/google/go-cmp/cmp/internal/flags loaded from github.com/google/go-cmp@v0.5.0,
	but go 1.16 would select v0.5.1
k6 imports
	go.k6.io/k6/cmd imports
	go.k6.io/k6/js imports
	go.k6.io/k6/js/modules/k6/grpc imports
	github.com/golang/protobuf/proto tested by
	github.com/golang/protobuf/proto.test imports
	github.com/google/go-cmp/cmp imports
	github.com/google/go-cmp/cmp/internal/function loaded from github.com/google/go-cmp@v0.5.0,
	but go 1.16 would select v0.5.1
k6 imports
	go.k6.io/k6/cmd imports
	go.k6.io/k6/js imports
	go.k6.io/k6/js/modules/k6/grpc imports
	github.com/golang/protobuf/proto tested by
	github.com/golang/protobuf/proto.test imports
	github.com/google/go-cmp/cmp imports
	github.com/google/go-cmp/cmp/internal/value loaded from github.com/google/go-cmp@v0.5.0,
	but go 1.16 would select v0.5.1

To upgrade to the versions selected by go 1.16:
	go mod tidy -go=1.16 && go mod tidy -go=1.17
If reproducibility with go 1.16 is not needed:
	go mod tidy -compat=1.17
For other options, see:
	https://golang.org/doc/modules/pruning
2022/02/02 11:03:08 [INFO] Cleaning up temporary folder: /Users/inanc/grafana/k6b/buildenv_2022-02-02-1103.1364873684
2022/02/02 11:03:08 [FATAL] exit status 1

But it's compatible with xk6-browser@main:

$ xk6 build v0.36.0 --output xk6-browser --with github.com/grafana/xk6-browser=.

Should we update the README to use k6@0.35.0 until we make another release? WDYT @imiric?

[robingustafsson]

@inancgumus We should either update the README with accurate and working instructions or make a new release.

[inancgumus]

@robingustafsson If we merge this PR, we'll have working instructions until the release: #198

[robingustafsson]

Ah, great, let's merge it! 😄