added alter table command to fluent query builder (progress)

test/backends/SchemaFixture.hpp

@@ -0,0 +1,16 @@
+#ifndef MATADOR_QUERY_SCHEMA_FIXTURE_HPP
+#define MATADOR_QUERY_SCHEMA_FIXTURE_HPP
+
+#include "matador/sql/connection_pool.hpp"
+
+namespace matador::test {
+class SchemaFixture {
+public:
+    SchemaFixture();
+
+protected:
+    sql::connection_pool pool;
+};
+}
+
+#endif //MATADOR_QUERY_SCHEMA_FIXTURE_HPP