Updated rules_rust to version 0.9.0 (bazelbuild#1503)

Updated rules_rust to version `0.8.1`. (bazelbuild#1484)

Updated rules_rust to version `0.8.0`. (bazelbuild#1472)

Updated rules_rust to version `0.7.0`. (bazelbuild#1436)

Updated `rules_rust` version to `0.6.0`. (bazelbuild#1397)

Updated `rules_rust` version to `0.5.0` (bazelbuild#1360)

Bump version to 0.4.0 (bazelbuild#1329)

Updated `rules_rust` version to `0.3.1` (bazelbuild#1296)

Updated `rules_rust` version to `0.3.0` (bazelbuild#1288)

Updating `rules_rust` version to `0.2.1` (bazelbuild#1243)