changed error message generation according to linter suggestions

plugins.go

@@ -1,7 +1,6 @@
 package rosetta
 
 import (
-	"errors"
 	"fmt"
 	"os"
 	"plugin"
@@ -13,24 +12,24 @@ func LoadPlugin(ir codectypes.InterfaceRegistry, pluginLocation string) (err err
 	pluginPathMain := fmt.Sprintf("./plugins/%s/main.so", pluginLocation)
 
 	if _, err := os.Stat(pluginPathMain); os.IsExist(err) {
-		return errors.New(fmt.Sprintf("Plugin file '%s' does not exist %s", pluginPathMain, err.Error()))
+		return fmt.Errorf(fmt.Sprintf("Plugin file '%s' does not exist %s", pluginPathMain, err.Error()))
 	}
 
 	// load module
 	plug, err := plugin.Open(pluginPathMain)
 	if err != nil {
-		return errors.New(fmt.Sprintf("There was an error while opening plugin on %s - %s", pluginPathMain, err.Error()))
+		return fmt.Errorf(fmt.Sprintf("There was an error while opening plugin on %s - %s", pluginPathMain, err.Error()))
 	}
 
 	initZone, err := plug.Lookup("InitZone")
 	if err != nil {
-		return errors.New(fmt.Sprintf("There was an error while initializing the zone %s", err.Error()))
+		return fmt.Errorf(fmt.Sprintf("There was an error while initializing the zone %s", err.Error()))
 	}
 	initZone.(func())()
 
 	registerInterfaces, err := plug.Lookup("RegisterInterfaces")
 	if err != nil {
-		return errors.New(fmt.Sprintf("There was an error while registering interfaces %s", err.Error()))
+		return fmt.Errorf(fmt.Sprintf("There was an error while registering interfaces %s", err.Error()))
 	}
 
 	registerInterfaces.(func(codectypes.InterfaceRegistry))(ir)