Update hyper-native-tls requirement from 0.2 to 0.3

[dependabot-preview]

Updates the requirements on hyper-native-tls to permit the latest version.

Commits

• 37ee5f7 Release 0.3.0
• b37cf71 Merge pull request #18 from Greeene/master
• e6fcdc6 Update tests
• 65c5db4 Update native-tls version to 0.2
• 0778261 Merge pull request #19 from Greeene/rust-bump
• 2f1cd96 Bump minimum rustc version to 1.21.0
• 64309bb Merge pull request #17 from equal-l2/rust-bump
• 1ec194f Bump minimum rustc version to 1.17.0
• ea44290 Note that tokio-tls should be used for 0.11
• c5df951 Release v0.2.4
• Additional commits viewable in compare view

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[glasserc]

#0  0x00005555555e4233 in <kinto_http::error::KintoError as core::convert::From<hyper::error::Error>>::from (err=...) at src/error.rs:45
#1  0x00005555555cc3f8 in <T as core::convert::Into<U>>::into (self=...)
    at /rustc/75cf41afb468152611212271bae026948cd3ba46/src/libcore/convert/mod.rs:558
#2  0x00005555555e4238 in <kinto_http::error::KintoError as core::convert::From<hyper::error::Error>>::from (err=...) at src/error.rs:45
#3  0x00005555555cc3f8 in <T as core::convert::Into<U>>::into (self=...)
    at /rustc/75cf41afb468152611212271bae026948cd3ba46/src/libcore/convert/mod.rs:558

(repeat infinitely...)