Adjust to match our changes in subprocess.hpp.
Index: server/Processors.hpp
--- server/Processors.hpp.orig
+++ server/Processors.hpp
@@ -59,7 +59,7 @@ bool matches(std::string processor_file, std::string t
 std::string process(std::string processor_file, std::string text) {
 
 	sp::popen proc (processor_file, {"process", text});
-	std::string result (std::istreambuf_iterator<char>(proc.stdout()), {});
+	std::string result (std::istreambuf_iterator<char>(proc.get_stdout()), {});
 
 	if (result.substr(result.length()-1, result.length()) == "\n") {
 		result.pop_back();
@@ -70,4 +70,4 @@ std::string process(std::string processor_file, std::s
 
 }
 
-#endif // PROCESSORS_H
\ No newline at end of file
+#endif // PROCESSORS_H