Add async readline/echo and add composer commands

examples/readline-echo.php

@@ -5,13 +5,13 @@
 use Amp\ByteStream\ZlibOutputStream;
 use Amp\Loop;
 use function Amp\ByteStream\bufferEcho;
-use function Amp\ByteStream\readLine;
+use function Amp\ByteStream\prompt;
 
 require __DIR__ . "/../vendor/autoload.php";
 
 Loop::run(function () {
     yield bufferEcho("Hello from async PHP!\n");
-    $question = yield readLine("What is your question? ");
+    $question = yield prompt("What is your question? ");
     yield bufferEcho("I see your question is $question.\n");
     yield bufferEcho("\nUnfortunately, I'm just a small script and I can't answer that, feel free to contact us at #amphp on freenode though!\n\n");
     yield bufferEcho("Bye!\n\n");

lib/functions.php

@@ -177,17 +177,17 @@ function getStderr(): ResourceOutputStream
 
 
 /**
- * Buffered async readline function.
+ * Buffered async version of the readline() function.
  *
- * Please note that this function will hungrily eat data from stdin, 
+ * Please note that this function will hungrily eat data from stdin,
  * buffering data even after the first newline.
  * Use getStdinLineReader()->getBuffer() to obtain the remaining buffered data.
  *
  * @param string $prompt Optional prompt to print to console
  *
  * @return \Amp\Promise Will resolve with the read line
  */
-function readLine(string $prompt = ''): Promise
+function prompt(string $prompt = ''): Promise
 {
     return call(static function () use ($prompt) {
         if ($prompt) {