doc: fixed toc in readme

README.md

@@ -14,25 +14,25 @@
 * [Supported operating systems](#supported-operating-systems)
 * [Installation instructions](#installation-instructions)
 * [Command Line Usage](#command-line-usage)
- + [Command line examples](#command-line-examples)
+  + [Command line examples](#command-line-examples)
- + [Command line reference: export](#command-line-reference-export)
+  + [Command line reference: export](#command-line-reference-export)
 * [Package Interface](#package-interface)
- + [PhotosDB](#photosdb)
+  + [PhotosDB](#photosdb)
- + [PhotoInfo](#photoinfo)
+  + [PhotoInfo](#photoinfo)
- + [ExifInfo](#exifinfo)
+  + [ExifInfo](#exifinfo)
- + [AlbumInfo](#albuminfo)
+  + [AlbumInfo](#albuminfo)
- + [ImportInfo](#importinfo)
+  + [ImportInfo](#importinfo)
- + [FolderInfo](#folderinfo)
+  + [FolderInfo](#folderinfo)
- + [PlaceInfo](#placeinfo)
+  + [PlaceInfo](#placeinfo)
- + [ScoreInfo](#scoreinfo)
+  + [ScoreInfo](#scoreinfo)
- + [SearchInfo](#searchinfo)
+  + [SearchInfo](#searchinfo)
- + [PersonInfo](#personinfo)
+  + [PersonInfo](#personinfo)
- + [FaceInfo](#faceinfo)
+  + [FaceInfo](#faceinfo)
- + [CommentInfo](#commentinfo)
+  + [CommentInfo](#commentinfo)
- + [LikeInfo](#likeinfo)
+  + [LikeInfo](#likeinfo)
- + [Raw Photos](#raw-photos)
+  + [Raw Photos](#raw-photos)
- + [Template Substitutions](#template-substitutions)
+  + [Template Substitutions](#template-substitutions)
- + [Utility Functions](#utility-functions)
+  + [Utility Functions](#utility-functions)
 * [Examples](#examples)
 * [Related Projects](#related-projects)
 * [Contributing](#contributing)