Fix handling of query_driver option in config file (#243)

src/config/schema.h

@@ -301,6 +301,7 @@ root:
     #
     compilation_database_dir: !optional string
     output_directory: !optional string
+    query_driver: !optional string
     add_compile_flags: !optional [string]
     remove_compile_flags: !optional [string]
     diagram_templates: !optional diagram_templates_t

src/config/yaml_decoders.cc

@@ -815,6 +815,7 @@ template <> struct convert<config> {
         get_option(node, rhs.using_namespace);
         get_option(node, rhs.using_module);
         get_option(node, rhs.output_directory);
+        get_option(node, rhs.query_driver);
         get_option(node, rhs.compilation_database_dir);
         get_option(node, rhs.add_compile_flags);
         get_option(node, rhs.remove_compile_flags);

src/config/yaml_emitters.cc

@@ -274,6 +274,7 @@ YAML::Emitter &operator<<(YAML::Emitter &out, const config &c)
 
     out << c.compilation_database_dir;
     out << c.output_directory;
+    out << c.query_driver;
     out << c.add_compile_flags;
     out << c.remove_compile_flags;