Adding QR code API to development section

Link has been dead since early August, removing dead service

Link has not been live in over 4 weeks, removing dead service.

Change Czech national bank´s category

Adding https://coinbin.org/ (from @kennethreitz) to the list.

Adding https://coinbin.org/ (from @kennethreitz) to the list.

sorry, forgot to change the HTTPS column

CoinMarketCap and CryptoCompare both are equally good but CryptoCompare supports logos for each currency. Thought this might be a good addition.

Czech national bank exchange rates
Corrected Imgur URL