Switched broken pypip.in badges to shields.io

[movermeyer]

Hello, this is an auto-generated Pull Request. (Feedback?)

Some time ago, pypip.in shut down. This broke the badges for a bunch of repositories, including tbgrep. Thankfully, an equivalent service is run by shields.io. This pull request changes the badges to use shields.io instead.

Unfortunately, PyPI has removed download statistics from their API, which means that even the shields.io "download count" badges are broken (they display "no longer available". See this). So those badges should really be removed entirely. Since this is an automated process (and trying to automatically remove the badges from READMEs can be tricky), this pull request just replaces the URL with the shields.io syntax.

[coveralls]

Coverage remained the same at 96.739% when pulling 1f8043cd68b8daab41e0a8829d6ab3fa6a41a152 on movermeyer:fix_badges into 3bc0030906d9bb82aebace585576c495111ba40c on lmacken:master.

[coveralls]

Coverage remained the same at 96.739% when pulling 1f8043cd68b8daab41e0a8829d6ab3fa6a41a152 on movermeyer:fix_badges into 3bc0030906d9bb82aebace585576c495111ba40c on lmacken:master.