Banner final retouching.

* Make `banner` public attribute
* Use builtin print() to avoid race condition with input()
* Add README section regarding banner

README.md

@@ -36,6 +36,7 @@ and they were completely right, the better way is called _Riposte_.
     * [Printing](#printing)
     * [History](#history)
     * [Prompt](#Prompt)
+    * [Banner](#Banner)
 * [Project status](#project-status)
 * [Contributing](#contributing)
 * [Versioning](#versioning)
@@ -464,6 +465,44 @@ foo:bar > unset
 foo >
 ```
 
+### Banner
+```python
+# banner.py
+
+from riposte import Riposte
+
+BANNER = """ _   _      _ _         _    _            _     _ _ 
+| | | |    | | |       | |  | |          | |   | | |
+| |_| | ___| | | ___   | |  | | ___  _ __| | __| | |
+|  _  |/ _ \ | |/ _ \  | |/\| |/ _ \| '__| |/ _` | |
+| | | |  __/ | | (_) | \  /\  / (_) | |  | | (_| |_|
+\_| |_/\___|_|_|\___/   \/  \/ \___/|_|  |_|\__,_(_)
+Welcome User Hello World v1.2.3
+"""
+
+repl = Riposte(banner=BANNER)
+
+
+@repl.command("hello")
+def hello():
+    repl.print("Hello World!")
+
+
+repl.run()
+```
+```bash
+$ python banner.py
+ _   _      _ _         _    _            _     _ _ 
+| | | |    | | |       | |  | |          | |   | | |
+| |_| | ___| | | ___   | |  | | ___  _ __| | __| | |
+|  _  |/ _ \ | |/ _ \  | |/\| |/ _ \| '__| |/ _` | |
+| | | |  __/ | | (_) | \  /\  / (_) | |  | | (_| |_|
+\_| |_/\___|_|_|\___/   \/  \/ \___/|_|  |_|\__,_(_)
+Welcome User Hello World v1.2.3
+
+riposte:~ $
+```
+
 ## Project status
 _Riposte_ is under development. It might be considered to be in beta phase. 
 There might be some breaking changes in the future although a lot of concepts 

riposte/riposte.py

@@ -22,8 +22,9 @@ def __init__(
         history_file: Path = Path.home() / ".riposte",
         history_length: int = 100,
     ):
+        self.banner = banner
+
         self._prompt = prompt
-        self._banner = banner
         self._commands: Dict[str, Command] = {}
 
         self._printer_thread = PrinterThread()
@@ -164,9 +165,10 @@ def _process(self) -> None:
     def run(self) -> None:
         self._printer_thread.start()
 
-        if self._banner:
-            self.print(self._banner)
-
+        if self.banner:
+            # builtin print() to avoid race condition with input()
+            print(self.banner)
+
         while True:
             try:
                 self._process()