README: yet another link fix
README: yet another link fix

Former-commit-id: 7a4b8a018acfd3e6c512d83e5dd25ce7a79ebbd0
lgbouma/astrobase,lgbouma/astrobase,lgbouma/astrobase,waqasbhatti/astrobase,waqasbhatti/astrobase,waqasbhatti/astrobase