Update changelog for v0.2.6

Fix leak in Message due to missing unref of sd_bus_message

ChangeLog

@@ -12,3 +12,6 @@ v0.2.4
 v0.2.5
 - Real fix for issue with sdbus::Struct inherited constructors
 - Little code refactorings and improvements
+
+v0.2.6
+- Fixed memory leak in Message copy operations

configure.ac

@@ -5,7 +5,7 @@ AC_PREREQ(2.61)
 # even micro numbers indicate released versions
 m4_define(sdbus_cpp_version_major, 0)
 m4_define(sdbus_cpp_version_minor, 2)
-m4_define(sdbus_cpp_version_micro, 5)
+m4_define(sdbus_cpp_version_micro, 6)
 
 m4_define([sdbus_cpp_version],
           [sdbus_cpp_version_major.sdbus_cpp_version_minor.sdbus_cpp_version_micro])

src/Message.cpp

@@ -48,6 +48,9 @@ Message::Message(const Message& other) noexcept
 
 Message& Message::operator=(const Message& other) noexcept
 {
+    if (msg_)
+        sd_bus_message_unref((sd_bus_message*)msg_);
+
     msg_ = other.msg_;
     type_ = other.type_;
     ok_ = other.ok_;
@@ -64,6 +67,9 @@ Message::Message(Message&& other) noexcept
 
 Message& Message::operator=(Message&& other) noexcept
 {
+    if (msg_)
+        sd_bus_message_unref((sd_bus_message*)msg_);
+
     msg_ = other.msg_;
     other.msg_ = nullptr;
     type_ = other.type_;