Update CHANGELOG [skip ci]

ikesyo · ikesyo · commit bd5cc7a275bc · 2018-06-28T09:58:11.000+09:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 *Please add new entries at the top.*
 
+1. [CocoaPods] CocoaPods 1.4.0 is the minimum required version. (#651, kudos to @ikesyo)
 1. `<~` bindings now works with optional left-hand-side operands. (#642, kudos to @andersio and @Ankit-Aggarwal)
 
    ```swift
