Use std::unique_ptr for pimpl idiom in HTTP client.

Author: glynos

http/src/http/v2/client/client.cpp

@@ -397,7 +397,7 @@ namespace network {
           : pimpl_(new impl(std::move(mock_resolver),
                             std::move(mock_connection), options)) {}
 
-      client::~client() { delete pimpl_; }
+      client::~client() { }
 
       std::future<response> client::execute(request req,
                                             request_options options) {

http/src/http/v2/client/client_errors.cpp

@@ -9,7 +9,7 @@
 
 namespace network {
   namespace http {
-    namespace v2 {
+  inline namespace v2 {
       class client_category_impl : public std::error_category {
 
        public:

http/src/network/http/v2/client/client.hpp

@@ -395,7 +395,7 @@ class client {
 private:
 
   struct impl;
-  impl *pimpl_;
+  std::unique_ptr<impl> pimpl_;
 
 };
 } // namespace v2