Raise the min version requirement because of the `?` operator#412

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dns2utf8 wants to merge 2 commits intorayon-rs:masterfrom dns2utf8:minimal_rust_version

+10-5

Commits on Sep 6, 2017

raise min rustc version to 1.13 for ? operator
dns2utf8
committed

Commits on Sep 9, 2017

Set futures crate to =0.1.14 so no ? operator is in the stable code
dns2utf8
committed