Update futures requirement from 0.1.13 to 0.3.11

[dependabot]

Updates the requirements on futures to permit the latest version.

Release notes

Sourced from futures's releases.

0.3.11

• Fixed heap buffer overflow in AsyncReadExt::{read_to_end, read_to_string} (#2314)

Changelog

Sourced from futures's changelog.

0.3.11 - 2021-01-14

• Fixed heap buffer overflow in AsyncReadExt::{read_to_end, read_to_string} (#2314)

0.3.10 - 2021-01-13

• Fixed type-inference in sink::unfold by specifying more of its types (breaking change -- see #2311)

0.3.9 - 2021-01-08

• Significantly improved compile time when async-await crate feature is disabled (#2273)
• Added stream::repeat_with (#2279)
• Added StreamExt::unzip (#2263)
• Added sink::unfold (#2268)
• Added SinkExt::feed (#2155)
• Implemented FusedFuture for oneshot::Receiver (#2300)
• Implemented Clone for sink::With (#2290)
• Re-exported MapOkOrElse, MapInto, OkInto, TryFlatten, WriteAllVectored (#2275)

0.3.8 - 2020-11-04

• Switched proc-macros to use native #[proc_macro] at Rust 1.45+ (#2243)
• Added WeakShared (#2169)
• Added TryStreamExt::try_buffered (#2245)
• Added StreamExt::cycle (#2252)
• Implemented Clone for stream::{Empty, Pending, Repeat, Iter} (#2248, #2252)
• Fixed panic in some TryStreamExt combinators (#2250)

0.3.7 - 2020-10-23

• Fixed unsoundness in MappedMutexGuard (#2240)
• Re-exported TakeUntil (#2235)
• futures-test: Prevent double panic in panic_waker (#2236)

0.3.6 - 2020-10-06

• Fixed UB due to missing 'static on task::waker (#2206)
• Added AsyncBufReadExt::fill_buf (#2225)
• Added TryStreamExt::try_take_while (#2212)
• Added is_connected_to method to mpsc::{Sender, UnboundedSender} (#2179)
• Added is_connected_to method to oneshot::Sender (#2158)
• Implement FusedStream for FuturesOrdered (#2205)
• Fixed documentation links
• Improved documentation
• futures-test: Added track_closed method to AsyncWriteTestExt and SinkTestExt (#2159)
• futures-test: Implemented more traits for InterleavePending (#2208)
• futures-test: Implemented more traits for AssertUnmoved (#2208)

0.3.5 - 2020-05-08

• Added StreamExt::flat_map.
• Added StreamExt::ready_chunks.
• Added *_unpin methods to SinkExt.
• Added a cancellation() future to oneshot::Sender.
• Added reunite method to ReadHalf and WriteHalf.
• Added Extend implementations for Futures(Un)Ordered and SelectAll.
• Added support for reexporting the join! and select! macros.

... (truncated)

Commits

• 7f509b5 Release 0.3.11
• b38805e Fix handling of malicious readers in read_to_end (#2314)
• 6f948ac Fix changelog release date
• 60b02d2 Release 0.3.10
• b008f34 Fix type-inference in sink::unfold() by specifying more of its types (#2311)
• 1db2b4e perf: Avoid an Option in the Map* futures (#2306)
• 1661bad Release 0.3.9
• 62e0328 Remove version from path dev-dependencies to make it easier to publish (#2305)
• 73aaf4a Run sanitizers on CI (#2303)
• 8e9b86e Do not redefine modules in futures crate (#2299)
• Additional commits viewable in compare view

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