Removed $GOPATH from the README.md and updated the example

[lonnblad]

Fix for #320

[codecov]

Codecov Report

Merging #349 into master will decrease coverage by 0.72%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #349      +/-   ##
==========================================
- Coverage   79.78%   79.06%   -0.73%     
==========================================
  Files          30       25       -5     
  Lines        2523     1987     -536     
==========================================
- Hits         2013     1571     -442     
+ Misses        395      320      -75     
+ Partials      115       96      -19     

Impacted Files	Coverage Δ
...xamples/db/vendor/github.com/cucumber/godog/run.go
...b/vendor/github.com/cucumber/godog/test_context.go
...mples/db/vendor/github.com/cucumber/godog/suite.go
.../db/vendor/github.com/cucumber/godog/stacktrace.go
...xamples/db/vendor/github.com/cucumber/godog/fmt.go

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