update readme

Author: juristr

README.md

@@ -6,14 +6,14 @@ This repository is organized in different branches, one branch for each video le
 
 ## Contents
 
-1. [Fetch data from an API using the HttpClient in Angular]()
-1. [Send data via Http using Angular]()
-1. [Handle HTTP error responses in Angular]()
-1. [Retry failed requests with the HttpClient in Angular]()
-1. [Set HTTP headers in Angular]()
-1. [Read custom HTTP headers sent by the server in Angular]()
-1. [Fetch non-JSON data using the HttpClient in Angular]()
-1. [Apply type checking to an Http response using the Angular HttpClient]()
-1. [Intercept HTTP requests in Angular]()
-1. [Listen to progress events using the Angular HttpClient]()
-1. [Mock HTTP Requests made with Angular’s HttpClient in Unit Tests]()
+1. [Fetch data from an API using the HttpClient in Angular](https://github.com/juristr/egghead-learn-http-in-angular/tree/fetch-data-from-api)
+1. [Send data via Http using Angular](https://github.com/juristr/egghead-learn-http-in-angular/tree/send-data-to-server)
+1. [Handle HTTP error responses in Angular](https://github.com/juristr/egghead-learn-http-in-angular/tree/handle-http-error-responses)
+1. [Retry failed requests with the HttpClient in Angular](https://github.com/juristr/egghead-learn-http-in-angular/tree/retry-failed-requests)
+1. [Set HTTP headers in Angular](https://github.com/juristr/egghead-learn-http-in-angular/tree/set-header-in-request)
+1. [Read custom HTTP headers sent by the server in Angular](https://github.com/juristr/egghead-learn-http-in-angular/tree/read-custom-headers)
+1. [Fetch non-JSON data using the HttpClient in Angular](https://github.com/juristr/egghead-learn-http-in-angular/tree/request-non-json-data)
+1. [Apply type checking to an Http response using the Angular HttpClient](https://github.com/juristr/egghead-learn-http-in-angular/tree/apply-type-checking)
+1. [Intercept HTTP requests in Angular](https://github.com/juristr/egghead-learn-http-in-angular/tree/intercept-http-in-angular)
+1. [Listen to progress events using the Angular HttpClient](https://github.com/juristr/egghead-learn-http-in-angular/tree/listen-progress-events)
+1. [Mock HTTP Requests made with Angular’s HttpClient in Unit Tests](https://github.com/juristr/egghead-learn-http-in-angular/tree/mock-http-in-unittests)