Add an f32() method to Rng.

sub_crates/rrand/src/lib.rs

@@ -58,6 +58,12 @@ impl Rng {
         let t = (self.state as u128).wrapping_mul(self.state as u128 ^ 0xe7037ed1a0b428db);
         ((t >> 64) ^ t) as u64
     }
+
+    /// Returns a random f32 in [0.0, 1.0).
+    #[inline(always)]
+    pub fn f32(&mut self) -> f32 {
+        u32_to_f32_norm(self.u32())
+    }
 }
 
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