Rename external matchers package to 'extensions'

Signed-off-by: Jatin Naik <jnaik@pivotal.io>

matchers/extensions/yaml/match_yaml_matcher.go

diff --git a/matchers/external/yaml/match_yaml_matcher.go b/matchers/extensions/yaml/match_yaml_matcher.go
similarity index 100%
rename from matchers/external/yaml/match_yaml_matcher.go
rename to matchers/extensions/yaml/match_yaml_matcher.go

matchers/extensions/yaml/match_yaml_matcher_test.go

diff --git a/matchers/external/yaml/match_yaml_matcher_test.go b/matchers/extensions/yaml/match_yaml_matcher_test.go
similarity index 98%
rename from matchers/external/yaml/match_yaml_matcher_test.go
rename to matchers/extensions/yaml/match_yaml_matcher_test.go
index 0f0f2f8..a378932 100644
--- a/matchers/external/yaml/match_yaml_matcher_test.go
+++ b/matchers/extensions/yaml/match_yaml_matcher_test.go
@@ -4,7 +4,7 @@
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
-	. "github.com/onsi/gomega/matchers/external/yaml"
+	. "github.com/onsi/gomega/matchers/extensions/yaml"
 )
 
 var _ = Describe("MatchYAMLMatcher", func() {

matchers/extensions/yaml/matchers_suite_test.go

diff --git a/matchers/external/yaml/matchers_suite_test.go b/matchers/extensions/yaml/matchers_suite_test.go
similarity index 100%
rename from matchers/external/yaml/matchers_suite_test.go
rename to matchers/extensions/yaml/matchers_suite_test.go