Adapting log level when files are not found

Fixes #143

Author: sebastienros

src/ImageSharp.Web/Middleware/LoggerExtensions.cs

@@ -23,12 +23,12 @@ internal static class LoggerExtensions
         static LoggerExtensions()
         {
             LogProcessingErrorAction = LoggerMessage.Define<string>(
-                logLevel: LogLevel.Error,
+                logLevel: LogLevel.Debug,
                 eventId: 1,
                 formatString: "The image '{Uri}' could not be processed");
 
             LogResolveFailedAction = LoggerMessage.Define<string>(
-                logLevel: LogLevel.Error,
+                logLevel: LogLevel.Debug,
                 eventId: 2,
                 formatString: "The image '{Uri}' could not be resolved");
 
@@ -100,4 +100,4 @@ public static void LogImagePreconditionFailed(this ILogger logger, string uri)
             LogPreconditionFailedAction(logger, uri, null);
         }
     }
-}
+}