Fix quotation in README.md

[GrayThinker]

I got this error:

Traceback (most recent call last):
File "c:\Users\jshat\Documents\Code\Machine Learning\Deep-Learning-Papers-Reading-Roadmap\download.py", line 88, in
readme_html = mistune.markdown(readme.read())
File "C:\Python37\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 0x9d in position 33411: character maps to

Due to the use of “” instead of "" in line 325 of README.md

line 325 (modified):
[1] J. Long, E. Shelhamer, and T. Darrell, "Fully convolutional networks for semantic segmentation." in CVPR, 2015. [pdf] ⭐⭐⭐⭐⭐