com_github_uber_prototool not included in WORKSPACE

[Evelyn Pai]

There are some external deps referencing https://github.com/uber/prototool that are not found in the workspace:

rules_proto/BUILD.bazel

Lines 5 to 6 in 4a1ebfa

 ":darwin": ["@com_github_uber_prototool_darwin//file"], 
 "//conditions:default": ["@com_github_uber_prototool_linux//file"], 

error message:

$ bazel build //...
Starting local Bazel server and connecting to it...
..................
INFO: SHA256 (https://github.com/google/protobuf/archive/48cb18e5c419ddd23d9badcfe4e9df7bde1979b2.tar.gz) = f5a35e17fb07f3b13517264cd17a089636fcbb2912f9df7bef7414058969a8d2
ERROR: /Users/ricky/vsco/rules_proto/BUILD.bazel:2:1: no such package '@com_github_uber_prototool_darwin//file': The repository could not be resolved and referenced by '//:prototool'
ERROR: Analysis of target '//:prototool' failed; build aborted: no such package '@com_github_uber_prototool_darwin//file': The repository could not be resolved
INFO: Elapsed time: 26.527s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (38 packages loaded)
    currently loading: @io_bazel_rules_go//proto

[Paul Cody Johnston]

Yeah that was an experiment. Can be removed.

[Paul Cody Johnston]

Removed.