Set log output on stderr

Resolve #503

doc/sphinx/changelog.rst

@@ -65,6 +65,11 @@ Changelog
 
   See: :func:`lief.logging.set_level`
 
+  .. note::
+
+     The log functions now output on ``stderr`` instead of ``stdout``
+
+
 
 0.10.1 - November 29, 2019
 --------------------------

src/logging.cpp

@@ -34,7 +34,7 @@ Logger::~Logger() = default;
 Logger::Logger(void) {
   // TODO(romain): Handle Android logcat sink
   if /* constexpr */ (lief_logging_support) {
-    this->sink_ = spdlog::stdout_color_mt("console");
+    this->sink_ = spdlog::stderr_color_mt("console");
 
     this->sink_->set_level(spdlog::level::warn);
     this->sink_->set_pattern("%v");