Also add errors to CMake

CMakeLists.txt

@@ -30,7 +30,7 @@ project(coeurl
 	DESCRIPTION "Simple library to do http requests asynchronously via CURL in C++."
 	HOMEPAGE_URL "https://nheko.im/nheko-reborn/cocurl")
 
-add_library(coeurl lib/client.cpp lib/request.cpp)
+add_library(coeurl lib/client.cpp lib/request.cpp lib/errors.cpp)
 add_library(coeurl::coeurl ALIAS coeurl)
 target_include_directories(coeurl PUBLIC
 	$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>