Move all files to lowercase.

 - Updated Podcasts

readme.md

@@ -14,31 +14,15 @@ This list is for:
 ## Contents
 
 - [Listening](#listening)
-  - [Podcasts](#podcasts)
-  - [Tech Podcasts](#tech-podcasts)
-  - [Interview Podcasts](#interview-podcasts)
-  - [Live Radio Stations](#live-radio-stations)
-  - [Sites](#sites)
 - [Speaking](#speaking)
-  - [Speaking Lessons](#speaking-lessons)
-  - [Pronunciation](#pronunciation)
 - [Watching](#watching)
-  - [YouTube](#youtube)
-  - [Live TV Channels](#live-tv-channels)
-  - [TV Talk Shows](#tv-talk-shows)
-  - [Tech Shows](#tech-shows)
 - [Reading](#reading)
 - [Writing](#writing)
 - [Grammar](#grammar)
 - [Vocabulary](#vocabulary)
-  - [Word lists](#word-lists)
-  - [Flashcards](#flashcards)
-  - [Online Dictionaries](#online-dictionaries)
 - [Tools](#tools)
 - [Exercises and Tests](#exercises-and-tests)
 - [Online Classes](#online-classes)
-  - [Private Classes](#private-classes)
-  - [Group Classes](#group-classes)
 - [FAQ or Common Questions](#faq-or-common-questions)
 - [Contribute](#contribute)