Making ReadMe/Doc sections more SEO Friendly

Author: shashank135sharma

README.md

@@ -16,9 +16,9 @@ We appreciate your continued support, thank you!
 # Table of Contents
 
 * [Installation](#installation)
-* [Quick Start](#quick_start)
+* [Quick Start](#quick-start)
 * [Usage](#usage)
-* [Use Cases](#use_cases)
+* [Use Cases](#use-cases)
 * [Announcements](#announcements)
 * [Roadmap](#roadmap)
 * [How to Contribute](#contribute)
@@ -79,7 +79,7 @@ You can just drop the jar file in. It's a fat jar - it has all the dependencies
 
 - [Java-HTTP-Client](https://github.com/sendgrid/java-http-client)
 
-<a name="quick_start"></a>
+<a name="quick-start"></a>
 # Quick Start
 
 ## Hello Email
@@ -180,7 +180,7 @@ public class Example {
 - [v3 Web API Mail Send Helper](https://github.com/sendgrid/sendgrid-java/tree/master/src/main/java/com/sendgrid/helpers) - build a request object payload for a v3 /mail/send API call.
 
 
-<a name="use_cases"></a>
+<a name="use-cases"></a>
 # Use Cases
 
 [Examples of common API use cases](https://github.com/sendgrid/sendgrid-java/blob/master/USE_CASES.md), such as how to send an email with a transactional template.
@@ -204,10 +204,10 @@ We encourage contribution to our libraries (you might even score some nifty swag
 
 Quick links:
 
-- [Feature Request](https://github.com/sendgrid/sendgrid-java/blob/master/CONTRIBUTING.md#feature_request)
-- [Bug Reports](https://github.com/sendgrid/sendgrid-java/blob/master/CONTRIBUTING.md#submit_a_bug_report)
+- [Feature Request](https://github.com/sendgrid/sendgrid-java/blob/master/CONTRIBUTING.md#feature-request)
+- [Bug Reports](https://github.com/sendgrid/sendgrid-java/blob/master/CONTRIBUTING.md#submit-a-bug-report)
 - [Sign the CLA to Create a Pull Request](https://github.com/sendgrid/sendgrid-java/blob/master/CONTRIBUTING.md#cla)
-- [Improvements to the Codebase](https://github.com/sendgrid/sendgrid-java/blob/master/CONTRIBUTING.md#improvements_to_the_codebase)
+- [Improvements to the Codebase](https://github.com/sendgrid/sendgrid-java/blob/master/CONTRIBUTING.md#improvements-to-the-codebase)
 
 <a name="troubleshooting"></a>
 # Troubleshooting