setUserAgent method has been added

Author: leventkaragol

src/libcpp-http-client.hpp

@@ -1,7 +1,7 @@
 /*
 
 Modern non-blocking HTTP Client library for C++ (17+)
-version 1.2.0
+version 1.3.0
 https://github.com/lk-libs/libcpp-http-client
 
 If you encounter any issues, please submit a ticket at https://github.com/lk-libs/libcpp-http-client/issues