build: Flexibilize CMake version and add Conan steps in docs (#427)

* Allow newer Cmake versions

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* comsume only asio cmake target

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Add Conan support in docs

Signed-off-by: Uilian Ries <uilianries@gmail.com>

---------

Signed-off-by: Uilian Ries <uilianries@gmail.com>

Author: uilianries

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.12...3.27 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.12...3.27)
 
 PROJECT(sioclient
     VERSION 3.1.0
@@ -62,7 +62,7 @@ else()
     find_package(websocketpp CONFIG REQUIRED)
     find_package(asio CONFIG REQUIRED)
     find_package(RapidJSON CONFIG REQUIRED)
-    target_link_libraries(sioclient PRIVATE websocketpp::websocketpp asio asio::asio rapidjson)
+    target_link_libraries(sioclient PRIVATE websocketpp::websocketpp asio::asio rapidjson)
 endif()
 
 include(GNUInstallDirs)

INSTALL.md

@@ -26,3 +26,14 @@ vcpkg install socket-io-client
 ```
 
 The Socket.IO client port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.
+
+### With Conan
+
+You can install pre-built binaries for Socket.IO C++ client or build it from source using [Conan](https://conan.io/). Use the following command:
+
+```
+conan install --requires="sioclient/[*]" --build=missing
+```
+
+The Socket.IO client Conan recipe is kept up to date by Conan maintainers and community contributors.
+If the version is out of date, please [create an issue or pull request](https://github.com/conan-io/conan-center-index) on the ConanCenterIndex repository.

README.md

@@ -45,6 +45,7 @@ Note: Only the WebSocket transport is currently implemented (no fallback to HTTP
 * [With CMAKE](./INSTALL.md#with-cmake)
 * [Without CMAKE](./INSTALL.md#without-cmake)
 * [With VCPKG](./INSTALL.md#with-vcpkg)
+* [With Conan](./INSTALL.md#with-conan)
 * [iOS and OS X](./INSTALL_IOS.md)
  * Option 1: Cocoapods
  * Option 2: Create a static library