Update README

Remove the installation option which is built from bazel

Author: Albert Dai

README.md

@@ -16,14 +16,6 @@ environment variables, additional arguments.
 ## Installation
 You can download the ios_test_runner.par binary in [release](https://github.com/google/xctestrunner/releases)
 
-or build the ios_test_runner.par binary by bazel:
-```
-$ git clone https://github.com/google/xctestrunner.git
-$ cd xctestrunner
-$ bazel build xctestrunner:ios_test_runner.par
-$ ls bazel-bin/xctestrunner/ios_test_runner.par
-```
-
 ## Usage
 - Build your app under test and test bundle. You can use Xcode.app,
 `xcodebuild` command line tool or [bazel](https://github.com/bazelbuild/bazel).