Allow PAGER to contain options
sensible-pager and git both allow the PAGER environment variable to contain spaces (e.g., "less -S"). pager-rs produces the following error in this case:
thread 'main' panicked at 'assertion failed: unsafe { libc::execvp(args[0], args.as_ptr()) } > -1', /home/kraai/.cargo/registry/src/github.com-1ecc6299db9ec823/pager-0.9.2/src/utils.rs:23
note: Run with `RUST_BACKTRACE=1` for a backtrace.I think it would be great if pager-rs handled this the same as sensible-pager and git.