Add support to special characters

[WendelHime]

As a developer I'd like to generate QR codes for making mobile devices connect to the specified network. Right now the library doesn't support the required alphanumeric character ; so I'm creating this PR for making it work and also adding some other characters.

The current behavior of the application is raising an exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "uQR.py", line 1276, in get_matrix
  File "uQR.py", line 1043, in make
  File "uQR.py", line 1109, in best_fit
  File "uQR.py", line 810, in write
TypeError: can't convert 'int' object to str implicitly

[cc123hh]

As a developer I'd like to generate QR codes for making mobile devices connect to the specified network. Right now the library doesn't support the required alphanumeric character ; so I'm creating this PR for making it work and also adding some other characters.

The current behavior of the application is raising an exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "uQR.py", line 1276, in get_matrix
  File "uQR.py", line 1043, in make
  File "uQR.py", line 1109, in best_fit
  File "uQR.py", line 810, in write
TypeError: can't convert 'int' object to str implicitly

作为一名开发人员，我想生成二维码以使移动设备连接到指定的网络。目前，该库不支持所需的字母数字字符; ，因此我正在创建此 PR 以使其正常工作，并添加一些其他字符。

应用程序的当前行为引发异常：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "uQR.py", line 1276, in get_matrix
  File "uQR.py", line 1043, in make
  File "uQR.py", line 1109, in best_fit
  File "uQR.py", line 810, in write
TypeError: can't convert 'int' object to str implicitly

I had the same problem.

And you, my friend, you are my personal hero!