Use easyjson for parsing library_index

Author: cmaglie

arduino/libraries/librariesindex/json.go

@@ -16,12 +16,12 @@
 package librariesindex
 
 import (
-	"encoding/json"
 	"fmt"
 
 	"github.com/arduino/arduino-cli/arduino/resources"
 	"github.com/arduino/arduino-cli/i18n"
 	"github.com/arduino/go-paths-helper"
+	easyjson "github.com/mailru/easyjson"
 	semver "go.bug.st/relaxed-semver"
 )
 
@@ -64,7 +64,7 @@ func LoadIndex(indexFile *paths.Path) (*Index, error) {
 	}
 
 	var i indexJSON
-	err = json.Unmarshal(buff, &i)
+	err = easyjson.Unmarshal(buff, &i)
 	if err != nil {
 		return nil, fmt.Errorf(tr("parsing library_index.json: %s"), err)
 	}