update README.md

Author: StefanoBelli

README.md

@@ -3,7 +3,9 @@
 [![Travis](https://img.shields.io/travis/StefanoBelli/xxtelebot.svg)](https://travis-ci.org/StefanoBelli/xxtelebot)
 **Bot API version: 4.3**
 
-# xxtelebot: A simple C++11 Telegram Bot API implementation
+# Discontinued project
+
+## xxtelebot: A simple C++11 Telegram Bot API implementation
 C++11 Telegram Bot APIs
 
 *This API wrapper tries to be as conformant as possible to Telegram Bot API, which you are invited to read.*

src/CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.2)
 
 find_package(PkgConfig REQUIRED)
-find_package(CURL REQUIRED)
+find_package(CURL REQUIRED VERSION 7.56.0)
 find_package(Threads REQUIRED)
 #find_library(GCRYPT_LIBRARY NAMES gcrypt libgcrypt)