Version 0.3.0

Created a new release version of rules_webtesting that includes prebuilt binaries.
Split repository rules based on the test language they support.

Add the following to your WORSKPACE file to use:

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "io_bazel_rules_webtesting",
    sha256 = "1c0900547bdbe33d22aa258637dc560ce6042230e41e9ea9dad5d7d2fca8bc42",
    urls = [
        "https://github.com/bazelbuild/rules_webtesting/releases/download/0.3.0/rules_webtesting.tar.gz",
    ],
)

load("@io_bazel_rules_webtesting//web:repositories.bzl", "web_test_repositories")

web_test_repositories()