Update PULL_REQUEST_TEMPLATE.md

Author: TikhomirovSergey

PULL_REQUEST_TEMPLATE.md

@@ -7,10 +7,12 @@ Please provide briefly described change list which are you going to propose.
 What types of changes are you proposing/introducing to Java client?
 _Put an `x` in the boxes that apply_
 
+- [ ] No changes in production code.
 - [ ] Bugfix (non-breaking change which fixes an issue)
 - [ ] New feature (non-breaking change which adds functionality)
 - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
 
+
 ## Details
 
 Please provide more details about changes if it is necessary. If there are new features you can provide code samples which show the way they