Add wrapper functions to bitflags types

This reduces potential breakage for users of this library.

See https://github.com/bitflags/bitflags/blob/main/CHANGELOG.md#200 for
context.

src/events.rs

@@ -357,6 +357,14 @@ bitflags! {
     }
 }
 
+impl EventMask {
+    /// Wrapper around `from_bits_retain` for backwards compatibility
+    #[deprecated = "Use the safe `from_bits_retain` method instead"]
+    pub unsafe fn from_bits_unchecked(bits: u32) -> Self {
+        Self::from_bits_retain(bits)
+    }
+}
+
 
 #[cfg(test)]
 mod tests {

src/watches.rs

@@ -223,6 +223,14 @@ bitflags! {
     }
 }
 
+impl WatchMask {
+    /// Wrapper around `from_bits_retain` for backwards compatibility
+    #[deprecated = "Use the safe `from_bits_retain` method instead"]
+    pub unsafe fn from_bits_unchecked(bits: u32) -> Self {
+        Self::from_bits_retain(bits)
+    }
+}
+
 impl WatchDescriptor {
     /// Getter method for a watcher's id.
     ///