patch 7.4.1922
Problem:    Ruby 2.4.0 unifies Fixnum and Bignum into Integer.
Solution:   Use rb_cInteger. (Weiong Mao)
diff --git a/src/version.c b/src/version.c
index 6dc2efb..39e70e5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1922,
+/**/
     1921,
 /**/
     1920,