Remove mentions of openssl < 0.8 not being supported

Installed Rust versions only support openssl >= 0.5.5

README.md

@@ -124,12 +124,6 @@ where libc was extracted.
  to modify its "source", the build will fail. Well behaved crates should only
  ever write to `$OUT_DIR` and never modify `$CARGO_MANIFEST_DIR` though.
 
-- Versions `0.7.*` and older of the `openssl` crate are NOT supported. `cross`
- supports `openssl` via the `OPENSSL_INCLUDE_DIR` and `OPENSSL_LIB_DIR`
- environment variables, that have been introduced in `0.8.*`. There's no work
- around, other than bumping the `openssl` dependency of the crates you are
- using.
-
 ## License
 
 Licensed under either of