Updates README.md

Updates to system requirements, also minor fixes.

README.md

@@ -1,6 +1,6 @@
 # Project64 - A Nintendo 64 Emulator for Windows
 
-#### System Requirements
+## System Requirements
 
 * OS
     * Windows XP or higher.
@@ -9,7 +9,9 @@
 * RAM
     * 512MB or more.
 * Graphics card
-    * DirectX 9 card or higher.
+    * DirectX 9 compatible or higher.
+* Sound card
+    * DirectX 9 compatible or higher.
 
 ## How to use
 
@@ -21,13 +23,13 @@ Installer for the latest stable release: https://www.pj64-emu.com/download/proje
 
 Follow the instructions in the setup window to complete the installation.
 
-### Support
+## Support
 
 Visit the FAQ page for help: https://www.pj64-emu.com/support-project64.html
 
 Join the official Project64 Discord Server to seek additional help from Project64 developers and the community: https://discord.gg/ys69Dak
 
-### Development Builds
+## Development Builds
 
 Development Builds are based off the latest source at GitHub. This allows you to use the latest changes straight away, though these changes may not be fully tested and have issues. Download at your own risk.
 
@@ -38,7 +40,7 @@ AppVeyor (Windows x86/x64): [![Build status](https://ci.appveyor.com/api/project
 
 <sub>Please note: x64 builds are **not** recommended for regular use! They are incomplete and very experimental, and currently _slower_ than 32-bit builds.</sub>
 
-### License
+## License
 
 Project64 is licensed under the
 [GNU General Public License v2.0](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html).