v0.6.2

• [Internal] Improve the concurrency
  • Shrink the scope of non-suspendable types (#[must_not_suspend]) for dropping them before reaching a suspend point (.await call). This avoids possible deadlocks, delays, and situations where Futures not implementing Send.
  • Reference: https://rust-lang.github.io/rfcs/3014-must-not-suspend-lint.html
• Bump dependencies (thanks to @sassman )