switch to GPL (for complience with wikidiff2) add the code.

test/test_pywikidiff2.py

@@ -0,0 +1,15 @@
+import pywikidiff2
+
+obj = pywikidiff2.pywikidiff2()
+obj = pywikidiff2.pywikidiff2(numContextLines=100000)
+print(obj.num_context_lines())
+print(obj.moved_line_threshold())
+print(obj.change_threshold())
+print(obj.moved_paragraph_detection_cutoff())
+print(obj.max_split_size())
+print(obj.initial_split_threshold())
+print(obj.final_split_threshold())
+
+res = obj.inline_json_diff("help! I'm alive", "help! dead I am")
+print('\n')
+print(res)