fix Markdown

Author: majewsky

README.md

@@ -3,11 +3,11 @@
 * [Implicit assumptions](#implicit-assumptions)
 * [Installation](#installation)
 * [Usage](#usage)
-** [Source specification](#source-specification)
-** [File selection](#file-selection)
-** [Transfer behavior: Segmenting](#transfer-behavior-segmenting)
-** [Transfer behavior: Expiring objects](#transfer-behavior-expiring-objects)
-** [Performance](#performance)
+  * [Source specification](#source-specification)
+  * [File selection](#file-selection)
+  * [Transfer behavior: Segmenting](#transfer-behavior-segmenting)
+  * [Transfer behavior: Expiring objects](#transfer-behavior-expiring-objects)
+  * [Performance](#performance)
 * [Log output](#log-output)
 * [StatsD metrics](#statsd-metrics)