parse false and other numbers

::

    $ ./otl-shell
    Erlang/OTP 18 [erts-7.0] [source] [64-bit] [smp:4:4] [async-threads:10] [kernel-poll:false]

    otl shell (Ctrl+g and then q to quit, Ctrl+g for Job Control Mode)

    >>> false true 1
    1
    >>> 92
    92
    >>> 42
    42
    >>>
    User switch command
     --> q

src/otl_lexer.xrl

@@ -1,8 +1,8 @@
 
 Definitions.
 
-Number = 1
-Bool = true
+Number = [0-9]
+Bool = (true|false)
 
 Endls       = (\s|\t)*(\r?\n)
 Whites      = \s+