fix: correct Sealed trait's visibility

fixes #15

src/lib.rs

@@ -153,6 +153,6 @@ pub enum Method {
 
 // Private trait used to seal other traits to disallow users from implementing
 // them directly
-pub(crate) mod seal {
-    pub(crate) trait Sealed {}
+mod seal {
+    pub trait Sealed {}
 }

src/query/ops/mod.rs

@@ -30,5 +30,4 @@ pub use cmp::Comparison;
 pub use logic::Logical;
 
 /// Marker trait for signifying that a type can be used with the operators
-#[allow(private_bounds)]
 pub trait Operable: Display + Sealed {}