Auto merge of #2855 - Turbo87:browserstack, r=locks
Auto merge of #2855 - Turbo87:browserstack, r=locks

README: Remove Browserstack section

We don't actually use this anymore at the moment

r? `@locks`

rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io