THRIFT-3337 Add testBool method to cross tests

This closes #611
diff --git a/lib/go/test/tests/thrifttest_handler.go b/lib/go/test/tests/thrifttest_handler.go
index eef45d5..50fe718 100644
--- a/lib/go/test/tests/thrifttest_handler.go
+++ b/lib/go/test/tests/thrifttest_handler.go
@@ -56,6 +56,10 @@
 	return thing, nil
 }
 
+func (p *ThriftTestHandler) TestBool(thing bool) (r bool, err error) {
+	return thing, nil
+}
+
 func (p *ThriftTestHandler) TestByte(thing int8) (r int8, err error) {
 	return thing, nil
 }