Bump backtrace-sys from 0.1.30 to 0.1.31

Bumps [backtrace-sys](https://github.com/alexcrichton/backtrace-rs) from 0.1.30 to 0.1.31.
- [Release notes](https://github.com/alexcrichton/backtrace-rs/releases)
- [Commits](https://github.com/alexcrichton/backtrace-rs/compare/backtrace-sys-0.1.30...backtrace-sys-0.1.31)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Cargo.lock

@@ -40,7 +40,7 @@ name = "backtrace"
 version = "0.3.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace-sys 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys 0.1.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-demangle 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -48,7 +48,7 @@ dependencies = [
 
 [[package]]
 name = "backtrace-sys"
-version = "0.1.30"
+version = "0.1.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1656,7 +1656,7 @@ dependencies = [
 "checksum atty 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)" = "1803c647a3ec87095e7ae7acfca019e98de5ec9a7d01343f611cf3152ed71a90"
 "checksum autocfg 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "22130e92352b948e7e82a49cdb0aa94f2211761117f29e052dd397c1ac33542b"
 "checksum backtrace 0.3.33 (registry+https://github.com/rust-lang/crates.io-index)" = "88fb679bc9af8fa639198790a77f52d345fe13656c08b43afa9424c206b731c6"
-"checksum backtrace-sys 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)" = "5b3a000b9c543553af61bc01cbfc403b04b5caa9e421033866f2e98061eb3e61"
+"checksum backtrace-sys 0.1.31 (registry+https://github.com/rust-lang/crates.io-index)" = "82a830b4ef2d1124a711c71d263c5abdc710ef8e907bd508c88be475cebc422b"
 "checksum base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0b25d992356d2eb0ed82172f5248873db5560c4721f564b13cb5193bda5e668e"
 "checksum bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3d155346769a6855b86399e9bc3814ab343cd3d62c7e985113d46a0ec3c281fd"
 "checksum byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a7c3dd8985a7111efc5c80b44e23ecdd8c007de8ade3b96595387e812b957cf5"