message: Add backtrace in travis
diff: @@ -16,7 +16,7 @@ matrix:
  rust: nightly
  env:
  - - RUSTFLAGS="-Ctarget-feature=+aes,+ssse3" RUSTDOCFLAGS="-Ctarget-feature=+aes,+ssse3"
  + - RUSTFLAGS="-Ctarget-feature=+aes,+ssse3" RUSTDOCFLAGS="-Ctarget-feature=+aes,+ssse3" RUST_BACKTRACE=1
  addons:
  apt:
  