fix UnicodeDecodeError

[mdcramer]

Hello Dan - I greatly enjoyed your presentation on Nov 14th (Introduction to Python for Data Science: Coding the Naive Bayes Algorithm). The combination of theory and code was excellent, especially given the format with all of the people.

When I ran your code on my Windows machine, however, I got this:

runfile('C:/Users/mcram/Documents/Github/Naive-Bayes-Evening-Workshop/run.py', wdir='C:/Users/mcram/Documents/Github/Naive-Bayes-Evening-Workshop')
Ok let's go!
Traceback (most recent call last):
File "", line 1, in
runfile('C:/Users/mcram/Documents/Github/Naive-Bayes-Evening-Workshop/run.py', wdir='C:/Users/mcram/Documents/Github/Naive-Bayes-Evening-Workshop')
File "C:\Users\mcram\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 710, in runfile
execfile(filename, namespace)
File "C:\Users\mcram\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 101, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "C:/Users/mcram/Documents/Github/Naive-Bayes-Evening-Workshop/run.py", line 16, in
json_text = load_json_files(datasource_info, verbose=True)
File "C:\Users\mcram\Documents\Github\Naive-Bayes-Evening-Workshop\datasource.py", line 12, in load_json_files
scraped_pages[name] = json.load(json_data, encoding="utf8")
File "C:\Users\mcram\Anaconda3\lib\json_init_.py", line 296, in load
return loads(fp.read(),
File "C:\Users\mcram\Anaconda3\lib\encodings\cp1252.py", line 23, in decode
return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x8d in position 4562891: character maps to

I just now reproduced the error. In my pull request I added encoding="utf8" to open(filepath, encoding="utf8") in datasource.py in order to avoid the error above. Please let me know if you have any questions.