Fix headers in README (#23)

README.md

@@ -42,13 +42,13 @@ Want to contribute? The team encourages community feedback and contributions. Pl
 If Calculator is not working properly, please file a report in the [Feedback Hub](https://insider.windows.com/en-us/fb/?contextid=130).
 We also welcome [issues submitted on GitHub](https://github.com/Microsoft/calculator/issues).
 
-# Data / Telemetry
+## Data / Telemetry
 This project collects usage data and sends it to Microsoft to help improve our products and services.
 Read our [privacy statement](http://go.microsoft.com/fwlink/?LinkId=521839) to learn more.
 Telemetry is disabled in development builds by default, and can be enabled with the `SEND_TELEMETRY`
 build flag.
 
-# Reporting Security Issues
+## Reporting Security Issues
 Security issues and bugs should be reported privately, via email, to the
 Microsoft Security Response Center (MSRC) at <[secure@microsoft.com](mailto:secure@microsoft.com)>.
 You should receive a response within 24 hours. If for some reason you do not, please follow up via
@@ -56,10 +56,10 @@ email to ensure we received your original message. Further information, includin
 [MSRC PGP](https://technet.microsoft.com/en-us/security/dn606155) key, can be found in the
 [Security TechCenter](https://technet.microsoft.com/en-us/security/default).
 
-# License
+## License
 Copyright (c) Microsoft Corporation. All rights reserved.
 
 Licensed under the [MIT License](.\LICENSE).
 
-# Contact
+## Contact
 Questions that can't be answered on GitHub? Reach out to the team: <[calculator@microsoft.com](mailto:calculator@microsoft.com)>