Add BSD license classifier

[czue]

closes #181

[czue]

@dannyroberts any guidance on this build error? Some additional set of commands I need to run?

=====================================

ERROR: ./.travis/test_cython_files.sh

-------------------------------------

diff --git a/jsonobject/api.c b/jsonobject/api.c

index 9f9114c..c299eac 100644

--- a/jsonobject/api.c

+++ b/jsonobject/api.c

@@ -1,4 +1,4 @@

-/* Generated by Cython 0.29.21 */

+/* Generated by Cython 0.29.23 */

 

 /* BEGIN: Cython Metadata

 {

@@ -12,15 +12,17 @@

 }

 END: Cython Metadata */

 

+#ifndef PY_SSIZE_T_CLEAN

 #define PY_SSIZE_T_CLEAN

+#endif /* PY_SSIZE_T_CLEAN */

 #include "Python.h"

 #ifndef Py_PYTHON_H

     #error Python headers needed to compile C extensions, please install development version of Python.

-------------------------------------

Compiling the C files from scratch shows a difference

The first 20 lines of the diff is shown above

Did you rebuild and commit the changes?  Try running:

    find jsonobject -iname '*.c' -delete

    find jsonobject -iname '*.so' -delete

    python setup.py build_ext --inplace

The command "if [[ $TRAVIS_PYTHON_VERSION > 3.5 ]]; then .travis/test_cython_files.sh; fi" exited with 1.

[dannyroberts]

I think to fix that you have to run pip install cython== 0.29.23 (see the first few lines of the diff where the version changes) followed by the "Try running" lines

find jsonobject -iname '*.c' -delete
find jsonobject -iname '*.so' -delete
python setup.py build_ext --inplace

which should rebuild the cython files. If you commit the changes that should fix the diff.

[dannyroberts]

It's admittedly a bummer that that's the responsibility of whoever happens to make a PR after the last time that a new 0.29.x point release of cython is released, but that seems to be how it's set up

[dannyroberts]

Thanks!

[czue]

kicked PR build and it's passing now.