Update further-reading.md

explore-cardano/further-reading.md

@@ -14,7 +14,7 @@ You may find these web materials and videos useful:
 
 
 Blog posts
-IOHK’s researchers and engineers often post on [our blog](iohk.io/blog). Here are a couple of  posts about stake pools and the Shelley testnet which you may find helpful:
+IOHK’s researchers and engineers often post on [our blog](https://iohk.io/blog). Here are a couple of  posts about stake pools and the Shelley testnet which you may find helpful:
 * _[From Byron to Shelley: Part one, the testnets](https://iohk.io/en/blog/posts/2020/04/29/from-byron-to-shelley-part-one-the-testnets/)_ - By Kevin Hammond, software engineer at IOHK
 * _[From Byron to Shelley: Part two, the journey to mainnet](https://iohk.io/en/blog/posts/2020/05/11/from-byron-to-shelley-part-two-the-journey-to-the-mainnet/)_ - By Kevin Hammond, software engineer at IOHK
 * _[How Pledging will keep Cardano healthy](https://iohk.io/en/blog/posts/2020/05/12/how-pledging-encourages-a-healthy-decentralized-cardano-ecosystem/)_ - By Lars Brünjes, director of education at IOHK