[fix] Fixes to matrix methods

src/matrix.h

@@ -1,8 +1,10 @@
 #ifndef MATRIX_H
 #define MATRIX_H
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <stdbool.h>
 
 #include "collections.h"
 
@@ -48,4 +50,4 @@ bool matrix_write(matrix_t *self, FILE *f);
 
 void matrix_destroy(matrix_t *self);
 
-#endif
+#endif