feat(library): ignore files under vendor dir (fanal#44)

analyzer/library/composer/composer.go

@@ -3,7 +3,6 @@ package composer
 import (
 	"bytes"
 	"path/filepath"
-	"strings"
 
 	"github.com/aquasecurity/fanal/analyzer"
 	"github.com/aquasecurity/fanal/extractor"
@@ -29,11 +28,6 @@ func (a composerLibraryAnalyzer) Analyze(fileMap extractor.FileMap) (map[analyze
 			continue
 		}
 
-		// skip analyze files which in dependency folder
-		if utils.StringInSlice(utils.COMPOSER_DEP_DIR, strings.Split(filename, utils.PathSeparator)) {
-			continue
-		}
-
 		r := bytes.NewBuffer(content)
 		libs, err := composer.Parse(r)
 		if err != nil {