Update crate r_unit

Author: bors

r_/un/r_unit

@@ -5,3 +5,4 @@
 {"name":"r_unit","vers":"0.1.5","deps":[],"cksum":"a2d35d5e750cce6d2cb5d60497652425c0aa5c7df2870e49629c892e2386ac1c","features":{},"yanked":false}
 {"name":"r_unit","vers":"0.1.6","deps":[],"cksum":"f581ee330b9c326a21d9ab4a0e54c48ed354bc61832fc0a4c717bc7a3043e125","features":{},"yanked":false}
 {"name":"r_unit","vers":"0.1.7","deps":[],"cksum":"13fc62a0e3d10965646d981a728eeba969c220b86ef245172f97cd5ddd90b114","features":{},"yanked":false}
+{"name":"r_unit","vers":"0.1.8","deps":[],"cksum":"b38b3fc5f57dc75c54ee4e74f8c9aa304db0b43cd575118f932ee352837445c0","features":{},"yanked":false}