Update README.md

Author: josemoracard

exercises/00-welcome/README.md

@@ -4,10 +4,10 @@ Python Requests is the most popular package for consuming APIs and doing HTTP re
 
 Here you will learn:
 
-1. How to do GET requests.
-2. How to fetch data properties and information.
-3. How to set request headers.
-4. How to set request content-type.
-5. How to do POST requests.
+1. How to do GET requests?
+2. How to fetch data properties and information?
+3. How to set request headers?
+4. How to set request content-type?
+5. How to do POST requests?
 
-Click the `Next →` button on the top right to continue.
+Click the `Next →` button on the top right to continue.