Fix compatibility with Simple Form `3.0`.
Fix compatibility with Simple Form `3.0`.

varun-raj/bootsy,ethomm/bootsy-bootstrap-alpha,InspireNL/bootsy,max-si-m/bootsy,ethomm/bootsy-bootstrap-alpha,InspireNL/bootsy,jwoertink/bootsy,hasanloo/bootsy,timrogers/bootsy,volmer/bootsy,ethomm/bootsy-bootstrap-alpha,varun-raj/bootsy,varun-raj/bootsy,shilpi230/bootsy,InspireNL/bootsy,votio/bootsy,votio/bootsy,volmer/bootsy,hasanloo/bootsy,volmer/bootsy,shilpi230/bootsy,shilpi230/bootsy,hasanloo/bootsy,max-si-m/bootsy,timrogers/bootsy,jwoertink/bootsy,max-si-m/bootsy,timrogers/bootsy,jwoertink/bootsy,votio/bootsy