Fix to build on windows (#8)

* adapt type of 'inbuf' for iconv()

'inbuf' should not be const to used as 2nd arg (char **) of iconv().

* specify library to link explicitly

When building visual studio 2022,
linker cause error 'libiconv_open is resolved ...' without this fix.

* Run black formatter

* Bump version

---------

Co-authored-by: Bodo Graumann <mail@bodograumann.de>

Author: gotoh

iconvmodule.c

@@ -56,7 +56,7 @@ Iconv_iconv(IconvObject *self, PyObject *args, PyObject* kwargs)
 {
     PyObject *inbuf_obj;
     Py_buffer inbuf_view;
-    const char *inbuf;
+    char *inbuf;
     char *outbuf;
     size_t inbuf_size, outbuf_size, iresult;
     long int inbuf_size_int, outbuf_size_int = -1;

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name="python-iconv",
-    version="1.1.2",
+    version="1.1.3",
     description="iconv-based Unicode converter",
     author="Bodo Graumann",
     author_email="mail@bodograumann.de",
@@ -15,5 +15,5 @@
 all iconv-provided encodings.
 """,
     py_modules=["iconvcodec"],
-    ext_modules=[Extension("iconv", sources=["iconvmodule.c"])],
+    ext_modules=[Extension("iconv", sources=["iconvmodule.c"], libraries=["iconv"])],
 )