Add missing method namespace

src/libmwereader/mwereader.cpp

@@ -60,12 +60,12 @@ bool MWEReader::registered = TokenReader::register_path_reader<MWEReader>(
 		// TODO implementataion
 	}
 
-	void set_annotation_channel(const std::string & chan_name)
+	void MWEReader::set_annotation_channel(const std::string & chan_name)
 	{
 		chan_ann_name = chan_name;
 	}
 
-	std::string get_annotation_channel_base_name()
+	std::string MWEReader::get_annotation_channel_base_name()
 	{
 		return chan_ann_name + "_base";
 	}