do not check host is github.com since GHE should be supported

github.go

@@ -41,12 +41,8 @@ func (gh *GitHub) Releases() ([]*github.RepositoryRelease, error) {
 	}
 }
 
-// GitHubFromURL creates GitHub instance from given repository URL
-func GitHubFromURL(u *url.URL) (*GitHub, error) {
-	if u.Host != "github.com" {
-		return nil, fmt.Errorf("only 'github.com' is supported but got '%s'", u.String())
-	}
-
+// NewGitHub creates GitHub instance from given repository URL
+func NewGitHub(u *url.URL) (*GitHub, error) {
 	// '/owner/name'
 	path := strings.TrimSuffix(u.Path, ".git")
 	slug := strings.Split(path, "/")

main.go

@@ -82,7 +82,7 @@ func main() {
 		fail(err)
 	}
 
-	gh, err := GitHubFromURL(url)
+	gh, err := NewGitHub(url)
 	if err != nil {
 		fail(err)
 	}

main_test.go

@@ -128,11 +128,6 @@ func TestInvalidRemoteURL(t *testing.T) {
 			input: "file:///path/to/file.txt",
 			want:  `unsupported protocol scheme "file"`,
 		},
-		{
-			what:  "not a GitHub URL",
-			input: "https://example.com",
-			want:  "only 'github.com' is supported but got 'https://example.com'",
-		},
 		{
 			what:  "repository does not exist",
 			input: "https://github.com/rhysd/this-repository-does-not-exist-oops",