CHANGES.md in pycall-1.3.0 vs CHANGES.md in pycall-1.3.1

@@ -1,6 +1,12 @@
 # The change history of PyCall
 
+## 1.3.1
+
+* Stop using `&proc` idiom to prevent warnings
+
+  *Kenta Murata*
+
 ## 1.3.0
 
 * Add `PyCall.without_gvl` for explicitly releasing the RubyVM GVL
 
 * Fix for missing if in PyObjectWrapper