bump plugin loading error log from warning to error

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.com>

cmd/ipfs/main.go

@@ -176,7 +176,7 @@ func makeExecutor(req *cmds.Request, env interface{}) (cmds.Executor, error) {
 		}
 		if ok {
 			if _, err := loader.LoadPlugins(pluginpath); err != nil {
-				log.Warning("error loading plugins: ", err)
+				log.Error("error loading plugins: ", err)
 			}
 		}