docs: update the sample and add descriptions of the options

Author: kenichiice

README.ja.md

@@ -22,6 +22,7 @@ require "test/unit/runner/junitxml"
 
 class MyTest < Test::Unit::TestCase
   def test_1
+    print("hello")
     assert_equal(1, 2)
   end
 end
@@ -32,20 +33,28 @@ $ ruby test.rb --runner=junitxml --junitxml-output-file=result.xml
 $ cat result.xml
 <?xml version="1.0" encoding="UTF-8" ?>
 <testsuites>
-	<testsuite name="MyTest" tests="1" errors="0" failures="1" skipped="0" time="0.0027089">
-		<testcase classname="MyTest" name="test_1(MyTest)" time="0.0026767" assertions="1">
+	<testsuite name="MyTest" tests="1" errors="0" failures="1" skipped="0" time="0.0047083">
+		<testcase classname="MyTest" name="test_1(MyTest)" time="0.0046712" assertions="1">
 			<failure message="&lt;1&gt; expected but was
 &lt;2&gt;.">
 Failure:
-test_1(MyTest) [test.rb:6]:
+test_1(MyTest) [test.rb:7]:
 &lt;1&gt; expected but was
 &lt;2&gt;.
 			</failure>
+			<system-out>hello</system-out>
 		</testcase>
 	</testsuite>
 </testsuites>
 ```
 
+## オプション
+
+* --junitxml-output-file=FILE_NAME
+  * XMLを、標準出力ではなく指定したファイルへ出力します。
+* --junitxml-disable-output-capture
+  * 標準出力と標準エラー出力のキャプチャを行わないようになります。
+
 ## ライセンス
 
 [MIT License](https://opensource.org/licenses/MIT)

README.md

@@ -22,6 +22,7 @@ require "test/unit/runner/junitxml"
 
 class MyTest < Test::Unit::TestCase
   def test_1
+    print("hello")
     assert_equal(1, 2)
   end
 end
@@ -32,20 +33,28 @@ $ ruby test.rb --runner=junitxml --junitxml-output-file=result.xml
 $ cat result.xml
 <?xml version="1.0" encoding="UTF-8" ?>
 <testsuites>
-	<testsuite name="MyTest" tests="1" errors="0" failures="1" skipped="0" time="0.0027089">
-		<testcase classname="MyTest" name="test_1(MyTest)" time="0.0026767" assertions="1">
+	<testsuite name="MyTest" tests="1" errors="0" failures="1" skipped="0" time="0.0047083">
+		<testcase classname="MyTest" name="test_1(MyTest)" time="0.0046712" assertions="1">
 			<failure message="&lt;1&gt; expected but was
 &lt;2&gt;.">
 Failure:
-test_1(MyTest) [test.rb:6]:
+test_1(MyTest) [test.rb:7]:
 &lt;1&gt; expected but was
 &lt;2&gt;.
 			</failure>
+			<system-out>hello</system-out>
 		</testcase>
 	</testsuite>
 </testsuites>
 ```
 
+## Options
+
+* --junitxml-output-file=FILE_NAME
+  * Output XML to the specified file instead of the standard output.
+* --junitxml-disable-output-capture
+  * Disable capture of standard output and standard error.
+
 ## License
 
 [MIT License](https://opensource.org/licenses/MIT)