ClientBase now derives from and use std::enable_shared_from_this

tests/parse_test.cpp

@@ -10,7 +10,7 @@ class ServerTest : public ServerBase<HTTP> {
 public:
   ServerTest() : ServerBase<HTTP>::ServerBase(8080) {}
 
-  void accept() {}
+  void accept() override {}
 
   void parse_request_test() {
     HTTP socket(*io_service);
@@ -59,6 +59,8 @@ public:
     return nullptr;
   }
 
+  void connect(std::shared_ptr<Session> &) override {}
+
   void constructor_parse_test1() {
     assert(host == "test.org");
     assert(port == 8080);