Correct Android link to .apk

Correct Android link to .apk

version and link fix

Update README.md

Update README.md

Update README.md

Update README.md

Added back beta links

Merge pull request getlantern#8342 from getlantern/myleshorton-readme

Updated minimum required versions in README

Merge pull request getlantern#8342 from getlantern/myleshorton-readme

Updated minimum required versions in README