Fix a typo (#1090)

README.md

@@ -692,7 +692,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [Restbed](https://github.com/corvusoft/restbed) - C++11 Asynchronous RESTful framework. [AGPL]
 * [Restinio](https://github.com/Stiffstream/restinio) - A header-only C++14 library that gives you an embedded HTTP/Websocket server. [BSD]
 * [c-ares](https://github.com/c-ares/c-ares) - A C library for asynchronous DNS requests. [MIT]
-* [cpp-httplib](https://github.com/yhirose/cpp-httplib) - A single file C++11 header-only HTTP/HTTPS sever library. [MIT]
+* [cpp-httplib](https://github.com/yhirose/cpp-httplib) - A single file C++11 header-only HTTP/HTTPS server library. [MIT]
 * [cpp-netlib](http://cpp-netlib.org/) - A collection of open-source libraries for high level network programming. [Boost]
 * [cpp-netlib/uri](https://github.com/cpp-netlib/uri) - URI parser/builder library for C++, compatible with RFC 3986 and RFC 3987. [BSL-1.0]
 * [CppServer](https://github.com/chronoxor/CppServer) - Ultra fast and low latency asynchronous socket server & client C++ library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution. [MIT]