Update go version in go.mod (go1.16). Update dependencies (#471)

* Update go version in go.mod (go1.17). Update dependencies.

* Update go version in go.mod (go1.17). Run go mod tidy in _examples.

* Update go version in go.mod (go1.16).

* Update go version in go.mod (go1.16).

_examples/go.mod

@@ -9,18 +9,19 @@ require (
 	github.com/cucumber/godog v0.0.0-00010101000000-000000000000
 	github.com/go-sql-driver/mysql v1.6.0
 	github.com/spf13/pflag v1.0.5
-	github.com/stretchr/testify v1.7.0
+	github.com/stretchr/testify v1.7.1
 )
 
 require (
 	github.com/cucumber/gherkin-go/v19 v19.0.3 // indirect
 	github.com/cucumber/messages-go/v16 v16.0.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/gofrs/uuid v4.0.0+incompatible // indirect
-	github.com/hashicorp/go-immutable-radix v1.3.0 // indirect
-	github.com/hashicorp/go-memdb v1.3.0 // indirect
+	github.com/gofrs/uuid v4.2.0+incompatible // indirect
+	github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
+	github.com/hashicorp/go-memdb v1.3.2 // indirect
 	github.com/hashicorp/golang-lru v0.5.4 // indirect
+	github.com/kr/pretty v0.3.0 // indirect
 	github.com/lib/pq v1.10.3 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )