Update crate dtype_variant

Author: bors

dt/yp/dtype_variant

@@ -9,3 +9,4 @@
 {"name":"dtype_variant","vers":"0.0.9","deps":[{"name":"dtype_variant_derive","req":"^0.0.9","features":[],"optional":false,"default_features":true,"target":null,"kind":"normal"}],"cksum":"4c94b821447ded2bd313d61aa03086b7ee846b224cd0a4b22db783dfa064c617","features":{},"yanked":false}
 {"name":"dtype_variant","vers":"0.0.10","deps":[{"name":"dtype_variant_derive","req":"^0.0.10","features":[],"optional":false,"default_features":true,"target":null,"kind":"normal"}],"cksum":"f259e534ea56f87544a38a534bd40862cad560f36594c67bbc6571acf9071858","features":{},"yanked":false}
 {"name":"dtype_variant","vers":"0.0.11","deps":[{"name":"dtype_variant_derive","req":"^0.0.11","features":[],"optional":false,"default_features":true,"target":null,"kind":"normal"}],"cksum":"aa65e7718f67ad5d96a889dbe4a5c06653c4876f508e0c7d494218537a39bc08","features":{},"yanked":false}
+{"name":"dtype_variant","vers":"0.0.12","deps":[{"name":"dtype_variant_derive","req":"^0.0.12","features":[],"optional":false,"default_features":true,"target":null,"kind":"normal"}],"cksum":"cefabbff1d8d459c5511eb33f253ccf7b0b1be5ce640356598aace499f9dcefd","features":{},"yanked":false}