Update bazel workspace and version to latest (#38)

.kokoro

diff --git a/.kokoro b/.kokoro
index 450a17e..19799ce 100755
--- a/.kokoro
+++ b/.kokoro
@@ -51,6 +51,10 @@
 
 fix_bazel_imports
 
-./.kokoro-ios-runner/bazel.sh test //:UnitTests --min-xcode-version 9.1.0
+bazel version
+use_bazel.sh 0.11.0
+bazel version
+
+./.kokoro-ios-runner/bazel.sh test //:UnitTests --min-xcode-version 8.3.0
 
 echo "Success!"

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 5cadb37..aa75261 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -14,10 +14,22 @@
 
 http_archive(
     name = "build_bazel_rules_apple",
-    url = "https://github.com/bazelbuild/rules_apple/archive/0.2.0.zip",
-    strip_prefix = "rules_apple-0.2.0",
+    url = "https://github.com/bazelbuild/rules_apple/archive/0.3.0.zip",
+    strip_prefix = "rules_apple-0.3.0",
     # Generated by running: openssl sha -sha256 <path to zip>
-    sha256 = "4ae91e15243fbe39a02b7e9a1bba6de50c5554443a30c5587cfeff7404dfdd56"
+    sha256 = "0c2f7b903c2334a3e7e0b565f0f80a854047ac36202978318f853cb762bf33f3"
+)
+
+git_repository(
+    name = "bazel_skylib",
+    remote = "https://github.com/bazelbuild/bazel-skylib.git",
+    tag = "0.2.0",
+)
+
+http_file(
+    name = "xctestrunner",
+    executable = 1,
+    url = "https://github.com/google/xctestrunner/releases/download/0.2.1/ios_test_runner.par",
 )
 
 http_archive(