update outated links to Hyperledger Indy project

[p-alik]

fixing issue #149.

[p-alik]

FYI: repository contains two non ASCII markdown files of twenty two.

education]$ find . -name "*.md" -exec file {} \; | grep CRLF
./LFS171x/docs/the-promise-of-business-blockchain-technologies.md: exported SGML document, UTF-8 Unicode text, with very long lines, with CRLF line terminators
./LFS171x/docs/introduction-to-hyperledger-indy.md: exported SGML document, UTF-8 Unicode text, with very long lines, with CRLF line terminators