Addubg missing commas

Fixing errors on lines 78 & 86 as per the failed Travis CI build.

Biblio.bib

@@ -33,8 +33,8 @@ @Misc{vishnumurthy03karma:a
 }
 
 @InProceedings{dwork92pricingvia,
-    url = {{http://www.wisdom.weizmann.ac.il/~naor/PAPERS/pvp.pdf}},
     note = {{https://web.archive.org/web/20170810035254/http://www.wisdom.weizmann.ac.il/~naor/PAPERS/pvp.pdf}},
+    url = {{http://www.wisdom.weizmann.ac.il/~naor/PAPERS/pvp.pdf}},
     author = {Cynthia Dwork and Moni Naor},
     title = {Pricing via processing or combatting junk mail},
     booktitle = {In 12th Annual International Cryptology Conference},
@@ -74,15 +74,15 @@ @Article{aron2012bitcoin
 
 @article{mastercoin2013willett,
 	url = {{https://github.com/mastercoin-MSC/spec}},
-	note = {{https://web.archive.org/web/20170810035927/https://github.com/OmniLayer/spec}}
+	note = {{https://web.archive.org/web/20170810035927/https://github.com/OmniLayer/spec}},
 	author = {J. R. Willett},
 	title = {{MasterCoin Complete Specification}},
 	year = {{2013}},
 }
 
 @article{colouredcoins2012rosenfeld,
 	url = {{https://bitcoil.co.il/BitcoinX.pdf}},
-	note = {{https://web.archive.org/web/20170810040120/https://bitcoil.co.il/BitcoinX.pdf}}
+	note = {{https://web.archive.org/web/20170810040120/https://bitcoil.co.il/BitcoinX.pdf}},
 	author = {Meni Rosenfeld},
 	title = {{Overview of Colored Coins}},
 	year = {{2012}},
@@ -120,7 +120,6 @@ @InProceedings{miller1997future
 
 @article{buterin2013ethereum,
 	url = {{https://github.com/ethereum/wiki/wiki/White-Paper}},
-	note = {{https://github.com/ethereum/wiki/wiki/White-Paper}},
 	author = {Vitalik Buterin},
 	title = {{Ethereum: A Next-Generation Smart Contract and Decentralized Application Platform}},
 	year = {{2013}},