Working on file append issue.

src/Logger.php

@@ -91,8 +91,13 @@ public function log($level, $message, array $context = [])
  // Create a new LogFormat instance to format the log entry.
  $message = LogFormat::create($level, $message, $context);
 
+ // Get the contents of the file before writing to it. This is so it can be appended.
+ $contents = $this->filesystem->read($filename);
+
+ $contents .= $message;
+
  // Write the log message from the Log Format instance to the Log Format file name instance.
- $this->filesystem->put($filename, $message."\n");
+ $this->filesystem->put($filename, $contents."\n");
  }
  }