fix heading capitalization

readme.md

@@ -24,8 +24,8 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 
 - [Platforms](#platforms)
 - [Programming Languages](#programming-languages)
-- [Front-end Development](#front-end-development)
-- [Back-end Development](#back-end-development)
+- [Front-End Development](#front-end-development)
+- [Back-End Development](#back-end-development)
 - [Computer Science](#computer-science)
 - [Big Data](#big-data)
 - [Theory](#theory)
@@ -127,7 +127,7 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [TypeScript](https://github.com/dzharii/awesome-typescript)
 
 
-## Front-end Development
+## Front-End Development
 
 - [ES6 Tools](https://github.com/addyosmani/es6-tools)
 - [Web Performance Optimization](https://github.com/davidsonfellipe/awesome-wpo)
@@ -179,7 +179,7 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [PostCSS](https://github.com/jjaderg/awesome-postcss)
 
 
-## Back-end Development
+## Back-End Development
 
 - [Django](https://github.com/rosarior/awesome-django)
 - [Flask](https://github.com/humiaozuzu/awesome-flask)