CHANGELOG.md in xapian-ruby-1.4.17 vs CHANGELOG.md in xapian-ruby-1.4.18

@@ -1,4 +1,8 @@
+## 1.4.18 (June 29th, 2021)
+
+- version bump to Xapian 1.4.18
+
 ## 1.4.17 (June 29th, 2021)
 
 - add compatibility for macOS Big Sur
 
 ## 1.4.16 (June 21st, 2020)